Topics: Subject and Verb Agreement
With the intake stroke, the piston is moving downward. That _______ the gasoline and air to move into the engine as the arrow shows.
A. allow
B. allows
Select your answer:
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Vocabulary › ViewThe water _______ in nature ensures a continuous supply of nutrients to aquatic ecosystems.
A. challenge
B. hardship
C. despite
D. cycle
Tenses › View
He had asked the permission of his boss.
A. Past perfect
B. Present perfect
C. Past simple