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Cars play an important role in modern life, but they ______ also cause many problems like air pollution. 
#63554
A
should
B
can
C
must
D
will
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(2014·衡水中学月考)You________scold such a pupil who always keeps silent so seriously that you________hurt him.
#62200
A
should;can 
B
may;will
C
mustn’t;may 
D
can’t;must
 -- Is it your brother playing football outside? -- It ________ be him. He is helping mother with dishes now.
#76128
A
must
B
can’t
C
mustn’t
D
can
 — Are you going to Beijing by air?— It’s fast, but expensive. So I’m not sure. I _____ take a train. 
#76481
A
may
B
will
C
must
D
should
—Why, my new computer is rubbish! Five hours has passed and it still hasn’t finished the downloading. —Don’t worry. You know, sometimes the Internet ________ be very slow.
#63366
A
can
B
may
C
should
D
must
--______you swim? -- No, I can’t. 
#76717
A
Can
B
May
C
Must
D
Need
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