Đổi các câu sau thành câu bị động 

161. They have put up banners and flags in the square.
162. They head teacher was making the announcement.
163. The tamer ordered the lion to lie on the floor.
164. They make Honda cars in Japan.
165. You can't break that door with your hand.
166. They were feeding the ducks when we came.
167. People said that Peter was absent from work that day.
168. They used to do it in the evening.
169. They will send you some flowers on that day.
170. They have spent much money on the plan.
171. Someone turn off the lights when I went out.
172. You must do your exercises more carefully.
173. Did they cut those flowers this morning ?
174. Student are doing lots of work.
175. People don't like her much.
176. Somebody has cleaned my shoes and washed my shirts.
177. People must not leave bucycles against the wall.
178. They show me the easier way to do it.
179. They used to start those cars by hand.
180. People said that Jack was a clever student.