[单项选择]The orchestra ______ for about ten minutes when a man in the audience suddenly began shouting.
A. was playing
B. had been played
C. had been playing
D. was played

[单项选择]The orchestra(管弦乐队) ______ for about ten minutes when a man in the audience suddenly began shouting.
A. was playing
B. had been played
C. had been playing
D. was played

[单项选择]It______ me about ten minutes to go to school by bike every day.

[单项选择]Ten minutes ______ an hour when one is waiting for phone call.
A. seemed
B. is seeming
C. seem
D. seems

[单项选择]Ten minutes ______ an hour when I’m depressed. ( )
A. seems
B. seem
C. seemed
D. is seeming

[单项选择]What does a new firm think about when it considers entering the market with a new product
A. Two external effects.
B. The externalities associated with entry.
C. The number of firms in the market.
D. The profit it would make.

[单项选择]

 We have no idea about when men first began to use salt, but we do know that it has been used in many different ways throughout the history. For example, it is recorded in many history books the people who lived over three thousand years ago ate salted fish. Thousands of years ago in Egypt, salt was used to preserve the dead. In some periods of history, a person who stole salt was thought to have broken the law. Take the eighteenth century for an example, if a person was caught stealing salt, he would be thrown into prison. History also records that only in England about ten thousand people were put into prison during that century for stealing salt! About one hundred and fifty years ago, in the year 1553, if a man took more than his share of salt, he would be thought to have broken the law and would be seriously punished. The offender’ s ear was cut off. Salt was an important item on the dinner table of a king. It was always placed in front of the king when he sat down
A. to punish people who had broken the law
B. to keep dead bodies from decay
C. to keep fish alive
D. to make chemicals

[单项选择]He has ______ for about ten years.

[单项选择]Every one can only play the games for ten minutes ______.
A. at a time
B. at any time
C. at times
D. at one time

[单项选择]Up _____into the air when the ten-second countdown was over.
A. the rocket shot
B. shot the rocket
C. was the rocket shot
D. the rocket was shot

[单项选择]Tommy said that he（）back within ten minutes.
A. will be
B. would be
C. be
D. was

[单项选择]Up ______ into the air when the ten-second countdown was over.
A. the rocket shot
B. shot the rocket
C. was the rocket shot
D. the rocket was shot

[单项选择]（） ten minutes earlier, you wouldn't have missed the train．But you were late.
A. Had you come
B. Did you come
C. Have you come
D. Should you come

[单项选择]When fifteen minutes had passed after the appointed time, the American ______.
A. told the secretary that he should not have been kept waiting
B. urged that he was waiting for him
C. put forward a suggestion that the secretary go and tell the minister that he was waiting
D. went about finding out whether the minister knew that he was waiting for him in the outer office

[单项选择]The theory was attacked ten years ago when it was first______, but gradually it was accepted.
A. promoted
B. enhanced
C. advanced
D. conceived