151. Nuisance – problem/ trouble/headache

152. Observe / spot --- see / watch / look

153. Obtain – find out/ get/ gain

154. obligation –duty

155. Occupy---take up

156. Occur – happen

157. odds – problem

158. painstaking – effort

159. Prefer to do sth/ prefer sth to sth ------ like doing sth better / like sth better

160. preserve – keep

161. Perhaps there is an element of truth in ------ perhaps they are all right in a way—

162. Place a high value --- praise/speak-- highly

163. poverty-stricken area– poor area

164. predicament – hardship

165. Promptly --- in time

166. prominent (men)--- important (men)

167. pursue – seek

168. Reluctantly --- be unwilling to do / unwillingly

169. Refer to sb as sth ---- call sb sth

170. Remind sb of ---- make sb remember sth

171. renowned – famous

172. reckless move – move on an impulse

173. resort to doing – adopt/take 采取

174. ringleader – main course

175. ruin – damage