36. Yesterday was my son’s _________ (twelve) birthday, he was very happy.
37. The more I said, the _________ they felt. (angry)
38. When you have difficulty_______ (solve) the problems, please ask me for help.
39. The new robot is moving around _______ (free) in the office.
40. The books __ _______ (write) by Guo Jingming are popular among the students.
41. The project they are talking about _______(need) improving.
42. __________________ litter carelessly in the schoolyard is bad manners. (drop)
43. Tony is 16 years old , I think he can look after ___ __(自己) well.
44. Many Chinese have trouble using a knife and fork __ _ (正确地).
45. Yellow can __ __(提醒)you of a warm, sunny day.
46. The bag on the chair is one of those __________ (工程师).
47. It is one of the tallest book __ __ (架子) in the reading-room.
48.The bridge broke down in the （地震）
49. It is eight fifteen now. We may also say it is a quarter ________(超过)eight.
50. I________（设法完成）to stop the baby crying just now.