19. I just don’t understand _______ that leads to so many teenagers becoming addicted to playing computer games.

A. why it does　　　 B. what it does　　　　 C. what it is　　　　　 D. why it is

18. Amy joined a painting group but didn’t seem to _______, so she left.

A. show off　　　　　 B. go up　　　　　　　 C. fit in　　　　　　　 D. come over

17. --- Did you enjoy yourself last night?

--- Yes, it’s very nice of you. I appreciated ________ to the party.

A. to be invited　　　 B. to have invited　　　 C. having been invited　　 D. having invited

16. Nowadays, teachers tend to be more dependent on _______ is thought to be a great teaching aid---the computer.

A. that　　　　　　　 B. which　　　　　　 C. what　　　　　　　 D. as

15. Whenever I met her, _________ was fairly often, she greeted me with a sweet smile.

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

14. ---Can I keep the book any longer?

---Yes, but it _______ be renewed when time is due.

A. shall　　　　　　 B. need　　　　　　　 C. will　　　　　　　 D. can

13. To ______ good relationships with your teachers and classmates, you should learn to be on good terms with them.

A. bring up　　　　　　　 B. add up　　　　 　　　 　C. keep up　　　　　　　　 D. take up

12. Your article must be sent by e-mail _______ it can meet the deadline.

A. or else　　 　　　　　 B. for fear that　　　 C. in case　　　 　　　　 D. so that

11. Darkness _________, so we had to stop our journey and stayed on a farm for the night.

A. fell　　　　　　　 B. spread　　　　　 C. broke　　　　　　 　D. happened