The life he is now used _____ quite different from ours.

A. is       B. to be

C. to being     D. to is

　　 The fact has worried many scientists ______ the earth is becoming warmer and warmer these years.

　　A. what B. which C. that D. though

--Do you know when the Chinese custom_________ from?

     --It's hard to say. But its characteristics__________ the Tang Period.

A. began; prove                 B. started; show

C. is; appear                   D. dates; suggest

They suggested not only ________to the party but also give a performance.

A. did we go     B. should we go      C. we should go        D. thought

--Are you sure to help me find____________ bed for my new house?

    --Of course, but not now. I'm heading, for____________ bed and a good sleep.

   A. a, a          B. a, 不填         C. the, a        D. a, the

—Why! Where's my passport? Maybe I left it on the plane.

     --My Goodness! You ____________ things behind.

A. had never left                B. didn't leave    

C. never left                    D. haven’t left

Some of the _______suspects refused to answer and kept their mouths shut.

A. questioning                   B. being questioned    

C. questioned                    D. to be questioned

I often have conversations with John over telephone, while keep in touch with Tom by__________ letter.

A.不填;;the      B. 不填;a         C. the;不填          D. the; a

She suggested to the police in the police station that__________.

A. Mr. Smith stole the necklace             

B. Mr. Smith should steal the necklace

C. Mr. Smith had stolen the necklace      

D. Mr. Smith steal the necklace

--I don't think we have met before.

--Yes, once at a party, but we___________.

A. weren't introduced             B. didn't introduce

C. haven't introduced             D. were not introducing