The new computer,  ____  he loves a lot, breaks down frequently.  
[     ]
A. which    
B.what    
C.that    
D. one
Sailing across the ocean alone was an achievement ______ took courage.
[     ]
A. what               
B. who                  
C. which               
D. where
China's railway system has carried out a real-name ticket purchasing system, _____ requires
passengers to provide their ID numbers when buying tickets.
[     ]
A. in which        
B. whose            
C. who              
D. which
The man as well  as his horse ____ crossed the river ____ from Tokyo.    
[     ]
A. which, come                  
B. that, comes    
C. who, came                    
D. who,come
He made another wonderful discovery , ____ of great importance to science.
[     ]
A. which I think is
B. which I think it is    
C. which I think it  
D. I think which is
Safety in school is of great concern because of the accidents ______ students got injured or killed.  
[     ]
A. in which         
B. when        
C. that        
D. for which
I'd like to tell you the Olympic snowboarding event, ______, was quite exciting.
[     ]

A. on which many people watched      
B. where many people watched TV
C. which many people watched on TV  
D. where many people watched on TV

Demand for well educated maids and nannies (保姆) is increasing, ____ are the wages for successful
applicants.
[     ]
A. which    
B. what
C. as        
D. those
Last summer holiday, I went back to my hometown, _____ the neighbors and the house ____ I used to be familiar with were gone.   
[      ]
A. only finding; which    
B. only to find; that    
C. to find; whom    
D. found; that
Experts believe that language learning is a process ______ skills are more important than grammar rules.  
[      ]
A. whose    
B. when  
C. of which      
D. in which
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