Walking exercises ____ be boring at times, but on a clear sunny morning nothing could be better．
#63356
A
may
B
will
C
must
D
should
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—Oh, my God！Our teacher is so mean!—Calm down, my friend.Even though she is tough sometimes, she ________ be nice if you really work hard.
#62515
A
must
B
should
C
can
D
shall
— Listen! Is that Linda singing in the next room?— No, it ________ be her. She is still in Shanghai.
#74974
A
mustn’t
B
can’t
C
may not
D
might not
Mr. Bush is on time for everything. How ____ it be that he was late for the important meeting?
#62618
A
can
B
should
C
may
D
must
A hot balloon blew up in Egypt. There ________ something wrong with the quality of it.
#62333
A
may have been
B
must be
C
need have been
D
might be
--- Can we leave the classroom now?-- No, you ______. You ______ to leave until the bell rings.
#75539
A
mustn’t, are allowed
B
don’t have to, are supposed
C
needn’t, aren’t allowed
D
can’t, aren’t supposed