Đặt câu hỏi cho từ gạch chân: I saw Ann. I didn’t see Mary

31. <!--[if gte vml 1]> <!--[endif]-->I am wrong.

32. I saw Ann. I didn’t see Mary.

33. John took your book. He told me so.

34. Remember to lock the door before you leave.

35. We reached Istanbul by train.

36. Being a hostess in fun.

37. I think that taking up yoga is not a good idea.

38. Be careful.

39. He was kind to help me.

40. Mrs. Jones spends too much time making up.

41. You’re mistaken.

42. Visit us again some time.

43. Don’t make too much noise.

44. I did my English test very well.

45. You can succeed only by hard work.

46. The smoke from factory chimneys polluted the air.

47. My mother made this cake.

48. I enjoy traveling.

49. David teaches in a Technical College.

50. Help me solve this problem.