87. There is an introduction of the writer at the 　　　(begin)of the book.

86. They are going to build a new shopping mall in this district, so these old houses 　　　　

　(pull)down in two weeks.

85. It is blowing 　　　　(hard)outside. You’d better put on your coat and your hat.

84. Looking after the old disabled people is really 　　　(tire)work, but I have learned a lot.

83. The police 　　　(have)caught the thief and found my passport and cell phone .

82. If old Tom 　　　(be)still alive, how happy he would be to see his son’s success!

81. I’m a shy girl. I prefer to stay at home rather than　　　 (hang)out with friends.

80. Linda is a 　　　　(help)girl. She always helps the old woman tidy her room.

79. Some people think computer is the most important 　　　　(invent).

78. The air in this room is not fresh.

Would you mind keeping the windows 　　　(open).