(2013·高考安徽卷)It ________ be the vocabulary that caused you the problem in the exercise because you know a lot of words.
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A
may
B
couldn’t
C
should
D
needn’t
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He _______ have taken your car by mistake because he didn’t have the keys.
#63034
A
mustn’t
B
shouldn’t
C
couldn’t
D
needn’t
--- Can you ride a horse?  --- No, I ______.
#78126
A
needn’t
B
may not
C
can’t
D
mustn’t
This book _____ Lucy’s. Look! Her name is on the book. 
#76581
A
must be
B
may be
C
can’t be
D
mustn’t be