_______ 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