Between the two parts of the concert is an interval, ______ the audience can buy ice-cream.

 A. when                B. where           C. that                 D. which

As he reached _____ back door, Jack saw _____ strange sight.

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

 Mom used only half of the money, the rest of which ______ saved for other purposes.

  A. is                 B. are              C. was              D. were

We should discuss the plan _____ before we work it out.

 A. in general          B. in detail            C. on time          D. on purpose

––Why didn’t you come to the party?

   ––I had meant _____, but something unexpected happened.

  A. so                     B. that             C. not              D. to

In that school, English is compulsory for all students, but French and Russia are ____ .

  A. special                B. optional         C. regional         D. original

 ––Who would you rather _____ your graduation ceremony tomorrow, your parents or friends?

   ––All of them.

   A. will have attended    B. have attended    C. attended     D. to attend

If you _____ smoke, please go outside because this is a non-smoking office.

A. must             B. should           C. can              D. may

Last month, the Japanese government expressed their thanks for the aid they ______ from China.

A. receive              B. had received     C. have received    D. are receiving 

Scientists say it may be five years ______ it is possible to test this medicine on human patients．

    A. since                B. until                C. before           D. when