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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 was always weak … languages but strong … science.

A. for

B. on

C. with

D. at

Which of the following is correct?

A. I haven’t barely started to think about my exam.

B. I have barely started to think about my exam.