_________ you take an active part in physical activity ______ be able to keep fit and stay healthy.
#80778
A
Only if; you will
B
Only if; will you
C
Unless; you will
D
Unless; will you
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－Why didn’t Tom give you one of his paintings? －I didn’t want one，but he would have given me one if I______.
#84420
A
did
B
would
C
will
D
had
Only when their children leave home _________.
#84489
A
many parents did feel a sense of loss
B
did many parents feel a sense of loss
C
did feel many parents a sense of loss
D
do many parents feel a sense of loss
________about the result of the experiment，he still wants to give it a try．
#80216
A
Uncertain as he is
B
As uncertain he is
C
As he is uncertain
D
Uncertain is he as
None of them could understand your meaning, _________?
#83062
A
could they
B
didn’t he
C
do they
D
could it
Not until Mr. Smith came to China ___ what kind of a country she is.
#80528
A
did he know
B
he knew
C
he didn't know
D
he could know