They managed to ______their experiments in spite of the difficulties.

[      ]

A. carry on
B. carry off
C. carry out
D. carry in
Whatever we do should _____ the environment.
[     ]
A. contribute for protecting
B. contribute to protect
C. contribute to protecting
D. contribute in protect
It was quite a job for her to _____ several children all by herself during the war.
[     ]
A. dress up    
B. bring up
C. break up
D. add up
Rather than _____ on crowded bus, he always prefers _____ a bicycle.
[     ]
A. ride; ride
B. riding; ride
C. ride; to ride
D. to ride; riding
The officer made his men _____ his order at once.
[     ]
A. carry out
B. work out
C. make out
D. act out?
The mail was _____ for two days because of the snow storm.
[     ]
A. held out　　　　　　　　　　　
B. held off
C. held up　　　　　　　　　　　　
D. held down
It is certain that he will __________his business to his son when he gets old.    
[     ]
A. take over                      
B. think over      
C. hand over                          
D. go over
We are required to________ our papers this afternoon.    
[     ]
A. hand out of                    
B. hand in    
C. hand on                          
D. hand over
You are_________him. You should make an apology to him.    
[     ]
A. curious about                  
B. mistaken about .      
C. worried about                    
D. particular about
After the long journey, I was entirely              .    
[     ]

A. taken out                    
B. given out    
C. made out                      
D. worn out

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