Scientists are convinced    the positive effect of laughter   physical and mental health.   

A.of; at     B.by; in     C.of; on       D.on;at

Though _____ my opinion, my mother didn’t say anything to show that she agreed with me.

A. against     B. on      C. for     D. in

Pleasant music is often played        classes to make students refreshed and relaxed for a while.

A．between  B．among    C．over D．after

There are altogether eleven books on the shelf, ______five are mine.

      A.on which          B. in which           C.of which          D. from which

In view of all sorts of rumors and guesses, experts carried out some careful and scientific research and         the possibility of a second earthquake in this area.

   A. blamed      B. discounted   C .attended  D. charged  

-----I have some big news for you. You’ve been accepted as a member of our club.

   -----_______ That’s great!

   A. Have I ?         B. Pardon?       C. Congratulations!     D. Good idea!

－It looks heavy. Can I give you a hand?

－                .

A. No, thanks       B. Yes, my pleasure

C. No, never mind           D. Yes, I do

— Why didn't you go to the cinema yesterday?  

    — I ____， but my wife returned from France the moment I was leaving.

A. was going to     B. would       C. did D. had

—Are you sure you really want it?

—_______，I am willing to pay ________price you ask．

A．No；no matter what                   B．Yes；no matter what

C．No；whatever                     D．Yes；whatever

Lucy has __________ all of the goals she set for herself in high school and is ready for new challenges at university．

　　A．acquired

　　B．finished

　　C．concluded

　　D．achieved