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The scientist _____ solutions to clean polluted rivers when she discovered a breakthrough.

A. researched

B. was researching

C. had researched

D. is researching

Look at these clouds, it _______very soon!

A. will rain

B. is raining

C. rains

D. has rained

He wasn’t teaching here last year, _____ ____?
A. weren’t they
B. was he
C. musn’t they
D. aren’t they

While studying, you should be considerate ___ other people.

A. of

B. with

C. to

D. for