单项选择题

Good travelers don't leave()on trains or airplanes.

A. rubbish
B. litter
C. garbage
D. pollutant

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单项选择题

Only when we have weighted all the factors involved()decide when would be the best time to start.

A. did we
B. we did
C. can we
D. we can

单项选择题

To achieve his heart's desire, he is racing the clock all the time. He is not the man()he was two years ago.

A. which
B. that
C. who
D. whom

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