After Yang Li Wei succeeded in circling the earth, _______ our astronauts desire to do is walk in space. 
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A
where
B
what
C
that
D
How
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In such hot weather the crops will have to be watered if they                  .
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A
have survived
B
are to survive
C
would survive
D
will survive
. The book, _______ is blue, is mine.
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A
the cover of which
B
whose cover
C
of which the cover
D
all the above