What do you mean, there are only ten tickets? There        be twelve.
[      ]
A. should          
B. would         
C. will          
D. shall
________it have been the failure to pick up directions from the ground control that caused the air crash?
[      ]
A. Must  
B. Could  
C. Would  
D. Should
The importance of saving gas________be stressed too much.Automobiles use up some
70 billion gallons of gas a year.
[     ]
A．can’t  
B．mustn’t
C．shouldn’t  
D．may not
The police still haven’t found the lost child，but they’re doing all they ________．
[     ]
A．can  
B．may
C．must  
D．should
—Hi, Johnson, any idea where Susan is?
—It's class time, so she        in the classroom now.
[     ]
A. can be          
B. must have been      
C. might have been  
D. should be
-Could I have a word with you,mum?
-Oh dear,if you ________.
[     ]

A．can  
B．must  
C．may  
D．should

She gave me a list in case I _____ forget what to buy. 
[    ]
A. must
B. should
C. might
D. would
He ____ give up the dictionary than a child would give up a new toy. 　
[     ]

A. will no longer　　
B. would rather
C. had better　
D. would no more

—Are you in a hurry?  
— No, in fact, I've got plenty of time. I _______ wait.  
[     ]
A. can            
B. may          
C. must            
D. should
The World Wide Web is sometimes jokingly called the World Wide Wait because it _____ be very slow.
[     ]
A. should
B. must
C. will
D. can
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