20. He said that the factory ______ for several years.

　　　　 A.　 has opened　　 B.　 opened　　　 C.　 had been open　　 D.　 is opening

19. ---Alice, why didn’t you come here yesterday?

　　 ---I ____ ,but my son suddenly fell ill and I had to take him to the hospital.

　　 A. had　　 B. did　 C. was going to　 D. didn’t

18. ---You seem to like sweets.

　　 ----_______. That’s probably why I’m becoming fatter and fatter.

　 A. So I do　　　 B. So do I　　　 C. So am I　　　　　 D. So I am.

17. ---We’ll do what we can ____English well this term.

　 ---It’s high time for you to work hard.

　 A. study　　　　 B. to study　　 C. be studied　　　 D. be studying

16. Is eating, drinking, or smoking ______ in the computer room?

　 A. protected　　　 B. shut down　　 C. pause　　　　　 D. allowed

15. Our knowledge of the universe never ______ all the time.

　 A. grows fast　　 B. stops growing　　　 C. grows again　 D. stops to grow

14. Did you know _______?

　 A. what in the bag was　　　　　　 B. was in the bad

　 C. what was in the bag　　　　　　 D. what was in the bag

13. She said there was going to _____ a football match tomorrow.

　 A. have　　　　　 B. has　　　　 C. be　　　　　 D. hold

12. Mary inventions have made our life _____.

　 A. to change a lot　　　　　　　　 B. change a lot

　 C. to change　　　　　　　　　　 D. change lots of

11. Li Lei knew little about the film _____ he saw it yesterday afternoon.

　 A. if　　　　　　 B. since　　　 C. until　　　　 D. because