171.In China, all the students work hard at school _____ going to university for higher education in the future.
A. in the habit of
B. in the hope of
C. in search of
D. in honor of
172.Mary dropped in _____ Mr. Smith, but he wasn't at home, so she went to drop in _____ Mr. Smith's office.
A.on；on
B.at; at
C.on；at
D.at；On
171.答案是B；考查介词短语在具体语境中的活用。in the habit of 有...的习惯;in the hope of/in hopes of 怀有...的希望;in search of 寻找;in honor of为了纪念。
172.答案是C；注意固定搭配:drop in on sb.顺便拜访某人;drop in at some place顺便到某地。
