climb the ladder. It is too dangerous. 
 [     ]
A. Please          
B. Let's
C. Don't              
D. Let us
—Can you tell me the way of making a banana milk shake?
—Yes. First, _____ three bananas. 
[     ]
A. peel          
B. peeling          
C. to peel  
D. peels
______ in the lake. It's dangerous (危险).

[     ]

A. Swim
B. Not swim
C. Don't swim
—______!What's that?
—It's a case.
[     ]
A. Look        
B. And        
C. Hello        
D. Yes
Let's ______.      
[     ]
A. go to home    
B. to go to home        
C. go home      
D. to go home
_____worry. Let me help you.      
[     ]

A. Not  
B. Don't  
C. Can't  
D. Don't be

_____ late for school again.  
[     ]
A. Not be
B. Don't is
C. Dont't be
D. Don't
____ so fast on the street.
[     ]
A. Don't run    
B. doesn't run    
C. running
用所给词的适当形式填空。
1. It's senen o'colock, let's _____(have) supper.
2. We should _____(exercise) all the time.
3. When the teacher came in, We all stopped _____(talk).
4. Li Mei is the _____(good) student in our class.
5. She has _____(work) here for ten years.
6. Chinese teacher is coming! Let's stop_____(have) lessons .
______ cross the road here.  
[     ]
A. Not    
B. Mustn't    
C. Don't    
D. Can't
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