According to common practice, the president _________ hold office for five years.
#62922
A
must
B
shall
C
need
D
will
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--Has Mr. White arrived, Tom?--Yes, sir. _____ he come in to see you right now?
#62360
A
Shall
B
May
C
Can
D
Must
All of us must do_______ to help protect the environment，or we will have more hazy weather雾霾天气.
#74653
A
something useful
B
anything useful
C
useful something
D
useful nothing
(2013·江苏南通市二模)We ________ have hurried all the way to the airport — the flight was called off because of the foggy weather.
#62421
A
mustn't
B
couldn't
C
needn't
D
wouldn't