单项选择题

Most environmental problems exist because adequate measures for preventing them （）taken in the past.

A. was not
B. were not being
C. were not
D. was no to be

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What did the girl’s enemy like to do（）

A. Talking with her.
B. Pointing out her weak points.
C. Reporting to the teacher.
D. Quarrelling with her.
单项选择题
How many people are on John Timbald’s crew（）

A. Four.
B. Five.
C. Six.
D. Twelve.
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