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Don’t make him __________ all the cleaning alone. After all, he is so young.
#49396
A
to do
B
do
C
not to do
D
doing
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 It's the first time for me           America.
#48879
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to go
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go to
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going to
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--Where’s Mr. Wang , do you know? -- Well, it’s hard to say. But I saw him        a football game just now.
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was watching
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had watched
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Ann spends two hours _______ sports in the gym every day.
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do
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Nowadays it’s very useful ______ a foreign language.
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learn
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There is a bird        in the sky.
#50711
A
fly
B
flying
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flies
D
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