A. was
B. have been
C. had been
D. am

A. when / had come
B. that / have come
C. when / came
D. that / had come

A. saw
B. have seen
C. had seen
D. was seeing

1. By the time he got home, his wife ______ (do) all the housework.
2. In the United States, lunch _______ (offer) to students for free at school.
3. The first step towards _______ (protect) the environment is to live a "low-carbon" lifestyle.
4. While I ______ (sweep) the floor yesterday, the telephone rang.
5. The audience are requested _______ (show) their tickets when they enter the cinema.
6. They _______ (eat) up all the food, but they still feel hungry.
7. We meet each other _______ (frequent) in this hotel.
8. I prefer basketball _______ football.
9. By reading we can ________ (rich) our vocabulary and improve our English.
10. My friend is growing _______ tired of English words that he wants to give it up.

1. Tom asked his mother where she has put his model warship. ______
2. The plane which pilot got a sudden heart attack was in great danger of crash. ______
3. The soup was smelt strange, so he asked the waiter to change it for another bowl. ______
4. Mrs. Smith bought three pet dogs, all of them were black. ______
5. The hurricane left the whole city in ruins and it seemed as if the world was at end. ______
6. Over 1% of the students in that school has caught the new type of flu. ______
7. Peope in Beijing also felt the quake, which is more than two hundred kilometers far away. ______
8. Dislike China, Canada has a much smaller population with much larger land. ______
9. He taught himself English while worked in a bank. ______
10. Along the way children dressed long wool coats stopped to look at us. ______

A. has left
B. is leaving
C. had left
D. left

A. had done
B. should do
C. did
D. do

A. had begun
B. had began
C. had been on
D. was on

A. had I turned
B. did I turn
C. I had turned
D. I turned

A. goes through 　　　　　　　
B. is going through 　　
C. have gone through　　　　　
D. had gone through