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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

. Which sentence uses past perfect tense correctly?

A. They had finished dinner before the movie started.

B. They have finished dinner now.

C. They are finishing dinner.

D. They finish dinner quickly.

He … ten cigarettes a day.

A. Smokes
B. Is smoking
C. Smoking
D. Smoke