Use the correct tense or form of verb in parentheses:
9. Today, young generation are fond of .............. jeans. (wear)
17. Saigon is believed ................ in the early 18th century. (discover)
24. He .................. a novel for many years (write), but he ................. it yet. (finish)
25. Mr. Quang ............... Math at school (teach) since he ................. (graduate) in this university in 1989.
28. The bags ................ on the wall are our team's. (hang)
30. The students discussed the problems ................. the pollution. (cause)
31. Originally, the book .................. write in English, and a few years later is .......................... (translate) into several languages.
32. Angkor Wat and Angkor Thom .................. in Cambodia several centuries ago. (construct)
33. The Golden Gate Bridge in San Francisco .................... in 1973. (complete)
34. When ...................... smoking? (your father/ give up)