You ____fail to pass the entrance examination if you don't study harder.
[     ]
A. shall      
B. could    
C. have to        
D. should
It ________ be really cold in November in Hefei though we usually have warm and sunny days.
[     ]
A. should  
B. will
C. must  
D. can
—What do you think we should do for our aged parents?
—I think the most important thing we ________ do is try to stay with them for more time.
[     ]
A. have to  
B. ought to
C. will  
D. would
As you know, although there are no classes on weekends now, no students ________ go out of school
without the headteacher's permission.
[     ]
A. will  
B. must
C. may  
D. shall
John promised his doctor he ________ not smoke, and he has never smoked ever since.
[     ]
A. might  
B. should  
C. could  
D. would
The traffic is heavy these days. I ________ arrive a bit late, so could you save me a place?
[     ]
A. can  
B. must
C. need  
D. might
She is a quiet girl. She ________ listen to records, alone in her room whenever she is free.
[     ]

A．should  
B．shall  
C．can  
D．will

That rude boy ________ have rushed out of the classroom when Ms Green was giving a lecture, which
finally led to his being punished by the head teacher.
[     ]
A．could  
B．must
C．dare  
D．should
It is reported that in the next few years the earth ______ possibly be hit by more extreme weather like storms.
[     ]
A. would
B. may
C. could
D. should
Lifting off at sunrise, the hot air balloon goes wherever the wind _____ blow.

[     ]

A. may
B. must
C. need
D. should
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