167. after, in (表时间)

　after接时间点，in接时间段 after 7:00, in five minutes

166. like, as

　like相似关系，但并不等同，as同一关系，两者实为一体 Don't treat me as a child. (In fact, I'm a child.)

165. day after day, day by day

　day after day日复一日(无变化)；day by day一天天地(有变化)Trees grow taller day by day.

164. at ease, with ease

　at ease舒适地，安逸地；with ease容易地，无困难地 do it with ease

163. increase to, increase by

　increase to增长到…，increase by增长了… The number increased by 2,000 to 5,000.

162. at work, in work

　at work在工作，在上班，in work 有职业，有工作 Both my parents are at work. They are not at home.

161. at, in (表地点)

　at小地点，in大地点 arrive at a small village, arrive in Shanghai

160. happen, take place

　happen偶然性的没有预料到的事情的发生，take place必然性的发生 Great changes have taken place in my hometown.

159. begin, start

　begin侧重时间的开始，反义词为end，start侧重由静到动的转折，反义词为stop Class begins at 7:30a.m.

158. set out, set about, set off

　指出发，着手解时，set out 后接 to do，set about 后接doing, set off 后接 for sp.