Only when he read the newspaper _____ the US President Obama would deliver a speech in his
university.
[     ]
A. he knew          
B. he had known      
C. had he known  
D. did he know
Her house _____ at 6 o’clock this morning and it _____ for about an hour.
[     ]
A. was on fire; caught fire              
B. caught fire; was on fire
C. had caught fire; had been on fire    
D. caught a fire; was on fire
In 1942, Columbus_______ on one of the Bahama Islands, but he mistook it for an island off India.
[     ]
A. lands          
B. landed          
C. has landed        
D. had landed
-Oh，it’s you！I________you.
-I have changed my hairstyle，and I’m wearing dark glasses.
[     ]
A．don’t recognize  
B．hadn’t recognized
C．didn’t recognize  
D．haven’t recognized
—When did you move to Zhenjiang?
—In 2010. And I ________ in Tibet for ten years.
[     ]
A. have worked  
B. was working
C. have been working  
D. worked
—Does your brother serve in the army?
—No, not now.  But he _____ in the army for 8 years.
[     ]

A.  would serve  
B.  was serving    
C.  had served      
D.  served

--- Haven't I told you that you should be home earlier?    
--- Yes, but I         home earlier than I usually do.
[     ]
A．was coming
B．will come
C．came
D．had come
— Did you go to the show last night?
— Yeah. Every boy and girl in the area ________ invited.
[    ]
A. were  
B. have been
C. has been  
D. was
The company had about 20 notebook computers but only one third ________ used regularly. Now we
have 60 working all day long.
[     ]
A. is  
B. are
C. was  
D. were
The Palmers chose to buy the house as its surroundings ________ clean and quiet.
[     ]
A . was  
B. being
C. had been  
D. were
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