题目内容

_______the midnight oil makes people lose their spirits at work.

A. Burned
Burning
C. To burn
D. Burns

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_____ these problems may be more complicated than we think.

A. Solving
B. Solve
C. Be solved
D. Solved

As college students__in exams is a rule we must abide by.

A. cheat
B. cheating
C. not cheating
D. not cheated

______the piano is not to be a musician, but to enter a vast world to purify their minds.

A. Play
B. Played
C. Plays
D. Playing

My mother's job is ____the children to school every day.

A. pick up
B. picking up
C. picked up
D. to pick up