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Researcher Lin Zhi developed a process for increasing the tensile strength--measured in gigapascals, or GPa--of silkworm ________ dissolving and reweaving the silk in a solution of iron metal ions, zinc, and sugar, Zhi increased the amount of force required to stretch it from approximately 0.5 GPa to 2 GPa.<br/><br/>Which choice completes the text so that it conforms to the conventions of Standard English?
Reading and WritingStandard English Conventions
Recently, engineer Erkka Frankberg of Tampere University in Finland used the chemical ________ to make a glassy solid that can withstand higher strain than silicate glass can before fracturing.<br/><br/>Which choice completes the text so that it conforms to the conventions of Standard English?
Reading and WritingStandard English Conventions
On July 23, 1854, a clipper ship called the _Flying Cloud_ left New York Harbor under the guidance of Captain Josiah Perkins Creesy and his wife, navigator Eleanor Creesy. Having entered San Francisco Bay a mere 89 days and 8 hours earlier, the celebrated ship set a record that would stand for 135 years.<br/><br/>Which choice completes the text so that it conforms to the conventions of Standard English?
Reading and WritingStandard English Conventions
He is known for enforcing a moral code called the Law of Piety, which established the sanctity of animal ________ the just treatment of the elderly, and the abolition of the slave trade.<br/><br/>Which choice completes the text so that it conforms to the conventions of Standard English?
Reading and WritingStandard English Conventions
Farouk El-Baz, a geologist and space scientist, ________ part of the team that selected the lunar landing sites for the Apollo program during the 1960s and 1970s.<br/><br/>Which choice completes the text so that it conforms to the conventions of Standard English?
Reading and WritingStandard English Conventions
Emperor penguins don't waddle out of the ocean. They launch themselves at such a high speed that they travel up to two meters before landing. How ________ A layer of microbubbles on their plumage reduces friction as the penguins speed to the surface.<br/><br/>Which choice completes the text so that it conforms to the conventions of Standard English?
Reading and WritingStandard English Conventions
the Sherpas pack up their telescopes and ________ ready.<br/><br/>Which choice completes the text so that it conforms to the conventions of Standard English?
Reading and WritingStandard English Conventions
Atoms in a synchrotron, a type of circular particle accelerator, travel faster and faster until they ________ a desired energy level, at which point they are diverted to collide with a target, smashing the atoms.<br/><br/>Which choice completes the text so that it conforms to the conventions of Standard English?
Reading and WritingStandard English Conventions
Formed in 1967 to foster political and economic stability within the Asia-Pacific region, the Association of Southeast Asian Nations was originally made up of five members: Thailand, the Philippines, Singapore, Malaysia, and Indonesia. By the end of the 1990s, the organization ________ its initial membership.<br/><br/>Which choice completes the text so that it conforms to the conventions of Standard English?
Reading and WritingStandard English Conventions
Professional American football player Fred Cox invented one of the world's most popular toys. In the 1970s, he came up with the idea for the Nerf football, which ________ of the harder and heavier regulation football.<br/><br/>Which choice completes the text so that it conforms to the conventions of Standard English?
Reading and WritingStandard English Conventions
Some historians ________ that this "tulip mania" was the first historical instance of an asset bubble, which occurs when investors drive prices to highs not supported by actual demand.<br/><br/>Which choice completes the text so that it conforms to the conventions of Standard English?
Reading and WritingStandard English Conventions
To survive when water is scarce, embryos inside African turquoise killfish eggs ________ a dormant state known as diapause. In this state, embryonic development is paused for as long as two years--longer than the life span of an adult killfish.<br/><br/>Which choice completes the text so that it conforms to the conventions of Standard English?
Reading and WritingStandard English Conventions
In 1903, environmentalist John Muir guided President Theodore Roosevelt on a scenic, sprawling trip through California's Yosemite Valley. Upon returning from the three-day excursion, Roosevelt ________ to conserve the nation's wilderness areas, a vow he upheld for his remaining six years in office.<br/><br/>Which choice completes the text so that it conforms to the conventions of Standard English?
Reading and WritingStandard English Conventions
During the American Civil War, Thomas Morris Chester braved the front lines as a war correspondent for the _Philadelphia Press_. Amplifying the voices and experiences of Black soldiers ________ of particular importance to Chester, who later became an activist and lawyer during the postwar Reconstruction period.<br/><br/>Which choice completes the text so that it conforms to the conventions of Standard English?
Reading and WritingStandard English Conventions
_Rabinal Achi_ is a precolonial Maya dance drama performed annually in Rabinal, a town in the Guatem highlands. Based on events that occurred when Rabinal was a city-state ruled by a king, had once been an ally of the king, but was later captured while leading an invading force against him.<br/><br/>Which choice completes the text so that it conforms to the conventions of Standard English?
Reading and WritingStandard English Conventions