173.　　　　　　　 The parents spent a whole day ________(look) for their child, but they failed. They reported the __________ (appear) of their child to the police.

172.　　　　　　　 We must try our best ______________ (stop) the world’s population from increasing.

171.　　　　　　　 How much ____________ the computer ____________? (cost)

170.　　　　　　　 I’m sorry we haven’t got this kind of cameras. They _________ (sell) out last week.

169.　　　　　　　 Before I came in, he ___________(search) the Internet for half an hour.

168.　　　　　　　 She seems ________________ (buy) a digital camera soon.

167.　　　　　　　 The girl is glad, she has bought a Canon camera ________________ (successful)

166.　　　　　　　 A newspaper ______________(report) will come to visit the old man.

165.　　　　　　　 Our teacher told us that there _____________ (be) a talk on the world’s population tomorrow afternoon.

164.　　　　　　　 Mike is busy ___________ (download) the information on the Internet.