[单项选择]All telemarketers should return to work （） the cause of the phone line malfunction is determined and repaired.
A. once
B. or
C. while
D. yet

[单项选择]Woman: Did you really work all of these problems without any help from the book
Man: Well, most of them anyway.
Question: What does the man imply（）。
A. Most of the problems were in the book.
B. He did need help on a few problems.
C. There’s more than one way to do the problem.
D. There were really too many problems to do:

[单项选择]The men work all week in the factory, and at the end of the week they get their pay. Naturally enough, they open the envelopes and they all count the money. One man is standing in the corner. He’s counting his money. Suddenly he realizes that it is wrong. He counts the money again. No doubt about it--there is a mistake. There is too much. Five pounds too much. He puts his money carefully in his pocket and says nothing to the others. A week goes by. It’s payday again. The men are counting their pay. The same man is standing in the comer. Suddenly he starts shouting. This time there isn’t enough money in his envelope. It’s five pounds short. He goes immediately to see the boss. He is very angry.
"Look," he says, "there isn’t enough money in my pay envelope." "That’s right," says the boss. "But didn’t you notice last week There was a mistake. There was too much. Five pounds too much." "Yes, that’s right," says the man (He is very angry). "There was a mistake last week. For one mistak
A. once a month
B. twice a month
C. once a week
D. every five days

[单项选择]Jane wasn’t at work all week （）an urgent family matter
A. due   
B. to owe
C. due to  
D. owing

[单项选择]________is known to all, too much smoking will cause lung cancer.
A. That
B. It
C. As
D. What