B．to be

　　C．that it has been

　　D．to have been

　　. --- An ant has two stomachs --- one for itself, one for others.

　　--- Really? Quite interesting. I ____

　　anything about it.

　　A. don’t know

　　B. have known

　　C. haven’t known

　　D. didn’t know

　　50. How long do you think it will be ________ the computer company puts forward a new product? A. before   

　　B. since   

　　C. until   

　　D. that

　　51. ---Would you like a cigarette ? ---sorry, It’s weeks

　　I smoked

　　A before

　　B after

　　C

　　since

　　D

　　until

　　52.－Can I pay the bill by check? －Sorry, sir. But it is the management rule of our hotel that payment ___ be made in cash.  A．shall B．need C．will D．can

　　. The scientists are able to _______accurately when the spaceship will reach the moon.  

　　A．accumulate B．calculate C．appoint D．estimate

　　.－You couldn’t have chosen a better way to solve the issue, I think.－________.  A．Well, nothing much B．Oh, don’t complain about it  C．Sorry, but I’ll find a better one D．Thanks a lot.

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