Tom and Mike are good friends. _____ often help each others.
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A
They
B
Them
C
Their
D
Theirs
推荐题目
–Are they ______books? --No, they aren't. They're ______ books. 
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A
you; they
B
your; he
C
your; her
D
your; she
All ________ I ever wanted to do was to travel.
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A
what
B
that
C
which
D
it
Does Linda enjoy ______ at Lana’s birthday party?
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A
herself
B
yourself
C
himself
D
themselves