51. You can write your wish on the piece of p .
52. My father is a worker. He works in a big f .
53. I believe that robots in the Future will have many different s .
54. You'd better not buy so p things for others.
55. Can you tell me what h to him yesterday?
56. My little son's dream is to go to Tsinghua U .
57. You are late again. Please give me a r .
58. They are old enough. They can look after t .
59. It is not easy for me to c dinner by myself.
60. I have cut the meat up. Can you m up the meat and vegetables?
What do you want to be when you ?
62. The teacher let me (查明) who broke the window.
63. During the party, all the children (化妆) as clowns.
64. No matter what happens (确保) that you can come on time.
65. The room is dark. Please (打开) the lights.