题目内容

_______ I have to give a speech, I get extremely nervous before I start.

A. Whatever
B. Whenever
C. Whoever
D. However

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Air pollution is getting more and more serious, so we must take action ______ it is too late.

A. before
B. after
C. until
D. when

Provide your doctor with a detailed medical history ______ he can give you accurate treatment.

A. even if
B. in case
C. so that
D. as though

The pupils were playing games in the classroom ______ a gunman entered and began shooting wildly at them.

A. while
B. when
C. as
D. before

There is no point advocating banning smoking in public ______ the law is introduced.

A. when
B. unless
C. since
D. because

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