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African American Percy Julian was a scientist and entrepreneur whose work helped people around the world to see. Named in 1999 as one of the greatest achievements by a US chemist in the past hundred years, ________ led to the first mass-produced treatment for glaucoma.
Which choice completes the text so that it conforms to the conventions of Standard English?
Difficulty: Medium
A:
Julian synthesized the alkaloid physostigmine in 1935; it
B:
in 1935 Julian synthesized the alkaloid physostigmine, which
C:
Julian's 1935 synthesis of the alkaloid physostigmine
D:
the alkaloid physostigmine was synthesized by Julian in 1935 and
Seneca sculptor Marie Watt's blanket art comes in a range of shapes and sizes. In 2004, Watt sewed strips of blankets together to craft a 10-by-13-inch _______ in 2014, she arranged folded blankets into two large stacks and then cast them in bronze, creating two curving 18-foot-tall blue-bronze pillars.
Which choice completes the text so that it conforms to the conventions of Standard English?
Difficulty: Medium
A:
sampler later,
B:
sampler;
C:
sampler,
D:
sampler, later,
The life spans of rockfish vary greatly by species. For instance, the colorful calico rockfish (Sebastes dall) can survive for a little over a ________ the rougheye rockfish (Sebastes aleutianus) boasts a maximum life span of about two centuries.
Which choice completes the text so that it conforms to the conventions of Standard English?
Difficulty: Easy
A:
decade: while
B:
decade. While
C:
decade; while
D:
decade, while
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