37. I was singing songs _____ walking home .

　　 A. as 　　　B. when 　　　C. at 　　　D. while

36. Before liberation many people could not _____ to go to school .

　　 A. afford 　　　B. offer 　　　C. pay 　　　D. able

35. I _____ first place in the competition .　

　　 A. beat 　　　B. defeat 　　　C. have won 　　　D. won

34. The guerrillas (游击队员)camped in the open and _____ wild plants .　

　　 A. lived with 　　　B. lived in 　　　C. lived on 　　　D. have lived on　

33. There are ____ of dark clouds in the sky .

　　 A. masses 　　　B. a mass 　　　C. mass 　　　D. much mass

32. It won't be long _____ he finishes his task .

　　 A. until 　　　B. after 　　　C. before 　　　D. when　

31. _______ , your composition is full of mistakes .

　　 A. Written carelessly 　　　B. Writing carelessly

　 C. Having written carelessly 　　　D. Being written carelessly

30. The vegetables didn't taste very good . They _____ too long .

　　 A. were cooked 　　　B. cooked 　　　C. had cooked 　　　D. had been cooked

29. What a pity . My new computer doesn't work . ____must be something wrong with it .　

A. This 　　　B. There 　　　C. It 　　　D. That　

28. The final time ___ we'll say good-bye to each other is coming .

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