— What's the population ____ the U.S.A?— The U.S.A has ____ population of 297 million.
#27937
A
of…a
B
of… /,
C
in…a
D
in … some
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At the foot of the hill you could hear nothing but the ______ of the running water.
#29771
A
shout
B
voice
C
noise
D
sound
__________ mother is a middle school teacher．
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A
Lucy’s and Lily
B
Lucy’s and Lily’s
C
Lucy and Lily’s
D
Lucy and Lily
―Congratulations, Jane, you have won the first prize in the physics competition.―Thank you, Mr Green. I can’t make such great __________ without your help.
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A
experience
B
experiment
C
progress
D
operation
The _____ now is that we have many _____ to ask.
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A
problem; questions
B
problems; question
C
question; problems
D
questions; problem