A. to leave    
B. going back    
C. travel

A. to walk    
B. walking    
C. walks      
D. walk

1. Children should know the           (safe) of the travel.
2. I tried every           (treat) the doctor suggested.
3. Don't make the baby           (laugh) all the time.
4. You are supposed           (shake) hands in China.
5. We were told           (not smoke) here.

A. to mend    
B. mending    
C. mend

A.  not to open    
B.  to open    
C.  open

A. so big that can hold        
B. big enough to hold        
C. enough big for holding

1.  "Don't play outside until you finish your homework,"Mother said to me.  (改为同义句)
    Mother told me______  ______ play outside before I finish my homework.
2.I think computers are more important than MP4.(改为同义句)
    I think MP4 aren't ______ important ______ computers.
3.  To protect wild animals is very important.  (改为同义句)
     ______  very important to______ wild animals.
4.  The girl's supposed to reach our school on time.  (改为反意疑问句)
    The girl's supposed to reach our school on time,______  ______  ?
5. The population of our city is 2,100,000.(对画线部分提问)
    ______  ______  the population of your city?

A. to play    
B. for play    
C. to playing

A. to do    
B. to be    
C. to is