As we know, the 2008 Olympic will________ in Beijing, China.
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A
take place
B
be taken place
C
be to be held
D
hold
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 Facing danger, he always _____ calm.
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A
seems
B
remains
C
becomes
D
appears
The two friends ______on the Internet for three hours, and they would go on till the next morning.
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A
have been chatting
B
had been chatting
C
were chatting
D
had chatted