— Why didn't you answer the phone?
— I'm terribly sorry,  but the doorbell________,  too.
[     ]
A. is ringing  
B. rang
C. was ringing  
D. was about to ring
— Alice, you look puzzled. Have you understood it?
— Yes, I _____ another problem just now.

[     ]

A. have thought of
B. thought of
C. was thinking of
D. had thought of
When Bill Gates decided to create Microsoft, he________law at Harvard University.
[     ]
A. studied  
B. had studied
C. was studying  
D. would study
Bob________after his classmate in the classroom when his teacher________.
[     ]
A. ran;turned up
B. was running;turned up
C. was running;would turn up
D. had run;would turn up
—Remember the first time we met, Jim?
—Of course I do. You________in the library.
[     ]
A. were reading  
B. had read
C. have read  
D. read
改错题。
One cold winter day in 1900, a small boy calling                                                           1.________
Charlie Chaplin walking along the street in London.                                                       2.________
He did not have breakfast and lunch. He wanted to                                                       3.________
buy some bread, and he didn't have any money.                                                            4.________
His father dead when he was very young. His                                                                5.________
mother was often very sick, and she could not take                                                        6.________
care of Charlie or his brother. All of them had to                                                           7.________
work to help their sick mother.
     He was a small boy but his dream was not very big.                                                 8.________
He wanted to be great man in the world of film. So                                                       9.________
he worked very hard to sing and danced well.                                                              10.________
Bob________after his classmate in the classroom when his teacher________.
[     ]
A．ran；turned up  
B．was running；turned up
C．was running；would turn up
D．had run；would turn up
Many of the audience ______ asleep when they ______ the lecture.
[     ]
A. fell; were hearing
B. were falling; heard
C. had fallen; heard
D. fell; had heard
— Have you finished reading Jane Eyre?
— No, I ___________ my homework all day yesterday.
[     ]

A. had done
B. would do
C. was doing
D. do

— Why didn't you come to our party yesterday? There was a lot of fun.
— I _________, but I had an unexpected guest at home.
A. had
B. was going to
C. did
D. would
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