_____ the car can be used has not been known yet.
A. If
B. What
C. That
D. Whether
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____we can’t understand is ____he didn’t join us in our discussion.
A. That; why
B. Which; how
C. What; what
D. What; why
The fact ____ he is a model teacher is well-known.
A. what
B. which
C. why
D. that
They expressed the hope____they would come over to China again.
A. which
B. whom
C. what
D. that
Sometimes we are asked ____ we think the likely result of an accident will be.
A. that
B. what
C. if
D. whether
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