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—Is Tom still in New York or already back at home? —I’m not sure _________. I’ll call to make sure.
#42722
A
if he has been back
B
that he has come back
C
why he has come back
D
how he will be back
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 Most of my classmates prefer loud music _______ they can dance to/
#42623
A
that
B
who
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D
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I have a friend _______ is training for the Olympics．　 
#43066
A
who
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 I’ll never forget the days ______ we spent together.
#42814
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#43213
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Is this the reason ______ at the meeting for his carelessness in his work?
#43072
A
he explained
B
what he explained
C
how he explained
D
why he explained