－Who called your sister just now? －I don’t know, but it was a girl’s_______.
#36206
A
sound
B
number
C
answer
D
voice
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—What happened to her _______ that cold winter evening? — I don’t know, and I’m also curious _______ it.
#37347
A
/, of
B
in, about
C
on, about
D
on, for
I ________ use a clock to wake me up because at six o’clock each morning the train comes by my house.
#41469
A
couldn’t
B
mustn’t
C
shouldn’t
D
needn’t