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 --- important 　　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