After Yang Liwei succeeded in circling the earth, _____ our astronauts desire to do is walk in space.
A. where
B. what
C. that
D. how
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______________ is not known yet.
A. When she has gone
B. Where she has gone
C. How did she leave
D. Why did she go
____________ is estimated is that 300 million farmers will become urban dwellers in three decades.
A. It
B. As
C. That
D. What
_______________ a person comes from will affect his or her style of speech.
A. What
B. Where
C. When
D. which
It's no longer a question now ______ man can land on the moon.
A. that
B. which
C. whether
D. what
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