21. The bags ………………. on the wall are our team’s. (hang) 22. The story ……………… by my teacher is very interesting. (tell) 23. The students discussed the problems ………………. the pollution. (cause) 24. Originally, the book ……………… (write) in English, and a few years later is ……………………. (translate) into several languages. 25. Angkor Wat and Angkor Thom ……………… in Cambodia several centuries ago. (construct) 26. The Golden Gate Bridge in San Francisco …………………… in 1973. (complete) 27. When ……………………………………… smoking ? (your father / give up) 28. The Greens …………………… in this city for 10 years. (live) 29. Our teacher …………………….. to us how to use the printer already. (explain) 30. Mai ………………………… the homework yet. (finish) 31. The match ………………………… . Our team are playing well. (just start) 32. Her cousin used to ……………… stamp when he was a boy. (collect) 33. Children enjoy ………………….. picture books. (read) 34. History …………………… in my school by Miss Lan last year. (teach) 35. She used a pencil ……………… this letter. (write) 36. Maria …………………… studying English for 5 years, now she ………… it yet. (study / master) 37. This book ………………… to me yesterday. (send) 38. If you come here in Spring, you ……………… a chance to go to the village fair. (have) 39. The books in the library ……………………… into sections. (arrange) 40. The card catalogue is helpful in ………………… the books you find. (find)