B. which we think that is important

　　C. we think which are important

　　D. which we think is important

　　14. The fact that a planet exists outside our solar system

　　encourages hope ______ other solar systems exist.

　　A. that

　　B. which

　　C. where

　　D. whether

　　15. People all over the world hold the belief ______ the economy will soon recover and life will improve.

　　A. when

　　B. which

　　C. in which

　　D. that

　　16. A warm thought suddenly came to me ______ I might use the pocket money to buy flowers for my mother’s birthday.

　　A. if

　　B. when

　　C. that

　　D. which

　　17. ______ he got off the bus did he find his pocket ______.

　　A. Not until; stolen

　　B. Unless; gone

　　C. Not until; picked

　　D. Unless; lost

　　18. If a student can make what has been learned whether in class or from social practice ______, he will make steady progress.

　　A. he

　　B. him C. himself

　　D. his

　　19. The father as well as his three children ______ skating on frozen river every Sunday afternoon in winter.

　　A. is going B. go C. goes D. are going

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