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In 1967, astrophysicist Jocelyn Bell Burnell detected a series of highly regular radio pulses while analyzing data from a newly constructed telescope. These strange signals, which were initially nicknamed 'Little Green Men' turned out to be the first evidence of rotating neutron stars. Today, these stars, known as pulsars, help astronomers map the structure of our galaxy.

Which of the following options represents the correct punctuation for the underlined portion?

Marie Tharp's career in cartography began at a time when women were barred from conducting research aboard vessels. Staying behind at Columbia University, Tharp transformed raw sonar data collected by her colleague Bruce Heezen into detailed three-dimensional drawings of the ocean floor. By meticulously plotting these depth measurements, she discovered a massive V-shaped rift valley running down the center of the Mid-Atlantic Ridge. While Heezen initially dismissed her findings as "girl talk" that supported the then-controversial theory of continental drift, Tharp persisted, eventually convincing him that the valley was real.

The writer wants to add a sentence at the end of the passage to conclude the paragraph by summarizing the significance of Tharp's discovery. Which choice best accomplishes this goal?

Although the software developers spent weeks refining the neural network's architecture; the unpredictable, complex, computer program crashed when exposed to the new dataset.

Which choice best punctuates the underlined portion of the sentence?

The following is an essay about a late-nineteenth-century invention:

[1]
In the late nineteenth century, the introduction of the safety bicycle revolutionized personal mobility. Unlike its predecessor, the "ordinary" or "penny-farthing"—which featured a massive front wheel, lacked brakes, and posed a constant threat of header crashes—the safety bicycle boasted two equal-sized wheels, a chain drive, and pneumatic tires. Cycling was no longer a dangerous stunt reserved for athletic young men; it became an accessible, comfortable activity for the general public.

[2]
Perhaps no group was more profoundly affected by this technological shift than women. For decades, societal norms restricted women's independence, confining their travel largely to distances they could walk or journeys chaperoned in carriages. The safety bicycle provided an unprecedented means of self-locomotion. Susan B. Anthony famously remarked that bicycling had "done more to emancipate women than anything else in the world," giving them a feeling of freedom and self-reliance.

[3]
The bicycle also drove significant changes in women's fashion. To ride comfortably, women abandoned heavy, restrictive Victorian corsets and voluminous skirts in favor of "rational dress," which included bloomers and shorter skirts. Although conservative critics decried these changes as scandalous, the practicality of the bicycle triumphed. In this way, the safety bicycle did not merely change how people traveled; it reshaped the social fabric of the era.

Suppose the writer’s goal had been to write an essay that traces the mechanical evolution of the bicycle from its earliest prototypes to modern designs. Would this essay accomplish that goal?

Read the passage below. Which punctuation mark should be placed in the blank to ensure the sentence is grammatically correct and internally consistent?

Community gardens have blossomed in urban areas over the last decade, transforming vacant lots into vibrant green spaces. These gardens not only provide fresh produce to neighborhoods that lack access to grocery stores, but they also foster a sense of community among diverse groups of residents. Volunteers work side-by-side, sharing gardening tips and building relationships that transcend age and cultural barriers.

[1] Indeed, many people enjoy working in these gardens every weekend. Over time, the lack of city funding or organizational support can cause these gardens to fall into disrepair. Soil testing, water access, and tools require ongoing investment that neighborhood volunteers often cannot afford on their own. Without a long-term management plan, many promising community gardens are eventually abandoned.

Which choice provides the most effective transition from the preceding paragraph to the paragraph that follows?

In 1938, Marjorie Courtenay-Latimer, a South African museum curator, received a call from a local fisherman who had caught a bizarre, heavy fish with limb-like lobed fins and an armored head. Recognizing its uniqueness, she sent descriptions to J.L.B. Smith, a prominent chemist and amateur ichthyologist, who identified it as a coelacanth—a primitive fish believed to have gone extinct 66 million years ago. This shocking discovery shook the scientific community, challenging long-held assumptions about the fossil record and the evolutionary history of vertebrates.

To find more specimens, Smith launched a decades-long search along the coast of the Indian Ocean, eventually discovering a second population near the Comoro Islands. Researchers soon realized that the coelacanth was not merely a lone survivor but part of a resilient, deep-water ecosystem that had remained largely undisturbed for eons. Consequently, J.L.B. Smith spent many years traveling along the coast of Africa looking for more of these creatures.

The writer wants to conclude the passage by emphasizing that the coelacanth's discovery continues to influence modern marine biology. Given that all the choices are true, which choice best accomplishes this goal?

The following passage is an essay about the ancient city of Petra.

[1]
Deep within the desert canyons of modern-day Jordan lies the ancient city of Petra, famous for its grand, red-sandstone facades carved directly into the cliff faces. Established as the capital of the Nabataean Kingdom as early as the fourth century BCE, Petra thrived as a major trading hub. However, its survival and prosperity in an arid environment depended not on its trade routes, but on the Nabataeans’ remarkable engineering: a sophisticated water management system.

[2]
The Nabataeans engineered a system that harnessed the region's rare but torrential flash floods. They constructed dams to redirect floodwaters away from the city center, preventing destruction, and routed the water into a network of cisterns and reservoirs carved into the rock. Aqueducts and ceramic pipes, pressurized to control flow rates, carried fresh spring water from miles away directly into the heart of the city. This engineering feat ensured a reliable year-round water supply for a population of over twenty thousand.

[3]
This mastery of water resource engineering transformed Petra from a barren outpost into a lush, oasis-like metropolis, complete with public gardens and fountains. By controlling the water supply, the Nabataeans not only secured their survival but also solidified their political and economic power in the region, demonstrating that human ingenuity could conquer one of nature's harshest landscapes.

Suppose the writer's goal had been to write an essay detailing how the Nabataeans engineered a water management system to sustain their desert capital. Is the statement that the essay successfully achieves this goal true or false?

Deep within a sandstone mountain on the Norwegian island of Spitsbergen lies the Svalbard Global Seed Vault, often referred to as the "Doomsday Vault." Designed to withstand natural and man-made disasters, the facility serves as a safety net for the world's agricultural biodiversity. It stores millions of seed samples from across the globe, preserving them in sub-zero temperatures. In the event of a global catastrophe or localized crop failure, these seeds can be retrieved to restart agricultural production.

While some critics argue that the resources spent on the vault would be better utilized in supporting active farming communities, proponents emphasize its long-term security benefits. Indeed, the vault has already proved its value. In 2015, researchers from the Middle East withdrew seeds to replace a gene bank destroyed by conflict. __________

Which of the following sentences, if added at the placeholder, would provide the most effective conclusion to the passage by reinforcing its main theme?

The sentences below are from a draft of a biographical essay about inventor Mary Anderson. Arrange the sentences in the most logical order to show how Anderson's observations of a transportation hazard led directly to her development of a practical safety device.

The writer is considering deleting the underlined sentence from the following paragraph:

In 1869, Austria introduced the 'Correspondenz-Karte,' which is widely considered the world's first official postcard. Unlike letters, these cards did not require envelopes, making them a cheaper and faster way to send short messages. They quickly gained popularity across Europe, as millions of people embraced this convenient new form of communication. Many early postcards featured simple decorative borders or small illustrations of famous landmarks. The first postage stamps had been introduced in Great Britain in 1840, featuring the profile of Queen Victoria. By the late nineteenth century, the postcard craze had spread globally, transforming how people shared quick updates with friends and family.

Should the writer make this deletion?

Passage Excerpt:

In 1981, a committee selected twenty-one-year-old architecture student Maya Lin’s design for the Vietnam Veterans Memorial in Washington, D.C. Rather than proposing a traditional, towering monument of white marble, Lin envisioned a simple, polished black granite wall cut into the earth. The names of the fallen soldiers would be carved chronologically onto the reflective surface, allowing visitors to see their own faces superimposed on the names of the dead. This design choice sparked considerable debate initially, but it eventually came to be recognized as a masterpiece of commemorative art.

Given that all the choices are true, which one best emphasizes the emotional and reflective connection between the visitors and the memorial, while maintaining the passage's somber, respectful tone?

In 1938, a South African museum curator named Marjorie Courtenay-Latimer discovered an unusual blue fish among a local trawler's catch. The specimen, which had lobe-like fins and a three-lobed tail, was later identified as a coelacanth. Scientists were astonished because this lineage of fish was believed to have gone extinct over sixty million years ago.

Which choice correctly punctuates the underlined portion of the passage?

Maya Hieroglyphs

[1] __________________________________________________ Historically, scholars like Eric Thompson argued that the glyphs were merely logographic symbols representing dates and astronomical concepts, with no phonetic elements. This view dominated Mayanist studies for decades, creating a consensus that Mayan writing could never be read phonetically. However, in the mid-twentieth century, Yuri Knorozov, a Soviet linguist, proposed that the glyphs represented syllables in addition to logograms. By comparing the signs in the surviving codices with spoken Mayan languages, Knorozov demonstrated that the script could indeed transcribe the sounds of spoken language, a breakthrough that revolutionized the field of Mesoamerican archaeology.

Knorozov's phonetic approach met with fierce resistance from the established academic community, but it eventually gained traction as other researchers successfully deciphered names, dynasties, and historical events recorded on monuments. The resulting translations transformed our understanding of Classic Maya society from a peaceful, stargazing civilization into one of complex political alliances, warfare, and rich literature.

The writer wants to begin the passage with a sentence that establishes its main focus: the shift in how scholars understood Mayan hieroglyphs. Which of the following sentences, if added at [1], would best accomplish this goal?

The following paragraph describes the invention of the QWERTY keyboard layout:

In 1868, printer and inventor Christopher Latham Sholes patented the first commercially successful typewriter. Sholes’s early models, however, had a frustrating flaw: if a typist struck adjacent keys in rapid succession, the metal typebars would easily collide and jam. To solve this problem, Sholes designed the QWERTY keyboard layout, placing frequently used letter pairs far apart on the keyboard. This design forced typists to work slightly slower, which successfully prevented the mechanical bars from sticking together. __________

Which of the following concluding sentences would best wrap up the paragraph by emphasizing the long-lasting impact of Sholes's invention?

Before the final spacecraft launch, the mission controllers double-checked the telemetry data. The controllers' primary worry was it's potential to be corrupted during transmission, which would jeopardize the entire landing sequence.

Which of the following options completes the underlined portion of the sentence in a grammatically correct way?

For decades, archaeologists assumed that the builders of Stonehenge were local Neolithic farmers who spent their entire lives within a few miles of the monument. Recent analyses of strontium isotopes in the teeth of individuals buried near the site have challenged this view, revealing that many of these people migrated from as far away as modern-day Wales and even continental Europe. Instead, the construction of the monument likely relied on a massive, collaborative network of distinct regional groups.

Which of the following choices best replaces the underlined portion to establish the most logical transition and correct punctuation?

Read the passage below about thermophilic bacteria. Which punctuation mark should be placed in the blank to grammatically connect the two independent clauses?

During the late nineteenth century, the art of botanical illustration underwent a significant shift. While earlier illustrators focused almost exclusively on the aesthetic beauty of flowers to decorate garden catalogs, later illustrators collaborated closely with taxonomists to document minute anatomical details. [1] These illustrators created highly precise drawings of seed pods, root structures, and leaf veins, which were essential for scientific classification. This partnership between art and science elevated botanical illustration from a hobby to an indispensable academic discipline.

The writer is considering adding the following sentence at Point [1]:

"Many of these artists preferred watercolor over oil paint because it dried faster and allowed for finer lines."

Should the writer make this addition?

Deep within the arid regions of western India, ancient subterranean structures known as stepwells (or *baolis*) served as crucial architectural marvels. First constructed over a thousand years ago to harvest monsoon rains, these engineering feats allowed communities to access water year-round despite the region's hyper-seasonal climate.

[1] Elaborate stone corridors descended multiple stories underground, leading down to cool, shaded pavilions where locals gathered to escape the scorching heat of the afternoon sun. Travelers rested along trade routes, women socialized while retrieving water, and families performed religious rituals, effectively turning a vital water source into a vibrant center of civic life.

Which choice most effectively introduces the second paragraph and establishes its main focus?