题目内容

The 3 college students did what they could do ______ the two children, although they themselves were put in danger.

A. rescue
B. rescued
C. to rescue
D. rescuing

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_______ they become dirty, the lakes are not able to clean themselves.

A. Once
B. Since
C. As
D. Because

The headmaster hurried to the concert hall only _______ the speaker _______.

A. to find; left
B. to find; had gone
C. finding; left
D. finding; had gone

The dog and the boy ___ are in the picture are very lovely.

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

There are many tall trees on _______side of the street.

A. both
B. all
C. neither
D. either

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