Practice Quiz Mode
Take all 5 MCQs in interactive quiz mode with timer and progress tracking
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
The Arctic-Alpine Botanic Garden in Norway and the Jardim Botanico of Rio de Janeiro in Brazil are two of many botanical gardens around the world dedicated to growing diverse plant ________ fostering scientific research; and educating the public about plant conservation.
Which choice completes the text so that it conforms to the conventions of Standard English?
Difficulty: Hard
A:
species, both native and nonnative,
B:
species, both native and nonnative;
C:
species; both native and nonnative,
D:
species both native and nonnative,
The US Geological Survey wants to map every human-made structure in the United States, and it is asking volunteers to help. Cassie Tammy Wang and Ashish D'Souza are just two of the many volunteer map editors who ________ to the project since it began in 2012.
Which choice completes the text so that it conforms to the conventions of Standard English?
Difficulty: Easy
A:
contribute
B:
will contribute
C:
have contributed
D:
will be contributing
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