I ________ thank you too much for all your help to my son while we were away from home.
[      ]
A. won't   
B. can't
C. can   
D. will        
The new law states that people ________ drive after drinking alcohol.    
[     ]
A. wouldn't        
B. needn't            
C. won't              
D. mustn't
I got close enough to hear them speaking Chinese, and I said "Ni Hao,"just as I________do in China.
[    ]
A. must  
B. might  
C. can  
D. should
It's quite warm here; we ________ turn the heating on yet .
[     ]
A. couldn't  
B. mustn't
C. needn't  
D. wouldn't
— ________  you interrupt now? Can't you see I'm on the phone?      
— Sorry  Sir, but it's urgent.       
[     ]
A. Can        
B. Should        
C. Must      
D. Would
He used to teach in that university and I ____   ride past it on my way to work.
[     ]
A. would      
B. could      
C. should      
D. might
When he was there, he _____ go to that coffee bar after work every day.
[     ]

A. was to        
B. would        
C. might        
D. should

They       have arrived at lunchtime but their flight was delayed.
[     ]
A. will            
B. can              
C. must          
D. should
— I wonder if I _____ smoke here.
— No, you ______ . Couldn't you see the sign "NO SMOKING" on the wall?
[     ]
A. can; needn't      
B. may; mustn't      
C. must; can't      
D. shall; won't
— Shall we have a smoke here?  
— No, we _______ because the workers are carrying some gas.
[     ]
A. mustn't          
B. won't          
C. can't            
D. needn't
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