_____ you are unable to deal with it, perhaps we should ask someone else for help.
Although
B. While
C. Since
D. Unless
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_______ I have to give a speech, I get extremely nervous before I start.
A. Whatever
B. Whenever
C. Whoever
D. However
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