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SUBJECT-VERB AGREEMENT: Choose the right form of the verb. When there ____________ thunderstorms approaching, we are always reminded of the threat of tornadoes.

A. IS
B. ARE

Which perfect tense is this sentence written in?
They had not closed the schools before the big snowstorm arrived. 
A. future perfect
B. past perfect
C. present perfect

Look at ___________ birds flying in the sky.

A. This
B. That
C. These
D. Those

A group in a scientific experiment that serves as a reference for comparison to the experimental group; a group that is untreated by the factor being tested.

A. variable

B. trials

C. control group

D. field study