Nowadays________Internet is becoming increasingly popular and new high speed broadband network was recently started.

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

—I stayed at a hotel while in New York.

—Oh, did you? You ________ with Barbara.

A. could have stayed      B. could stay

C. would stay  D. must have stayed

His earliest plays are excellent, but his latest one is ________.

A. something  B. everything

C. anything     D. nothing

On Sundays there were a lot of children playing in the park, and _______ parents were seated together joking.

A. their   B. whose

C. which D. that

The poet and _________pianist is going to give us a talk this afternoon.

  A. a   B. the     C. 不填     D. an

The changes in our chemistry lab will cost quite a lot, ____ they will save us money in the long run.

    A. or                B. since            C. for                D. but

They were surprised that a four-year-old boy should work out such a difficult problem ____ they themselves couldn’t.

      A. once          B. then               C. while           D. if

Nobody has the right to go there to have dinner free,____?

A. hasn’t it          B. has it        C. haven’t they           D. have they

It was ____ the old worker came that we ____ the  experiment.

    A. until; didn’t begin              B. not until; began

    C. until; began                     D. not until; didn’t begin

It was quite a serious mistake, ____caused by carelessness.

   A. which I think was                 B. I think which was  

   C. which I think it was              D. I think which it was