35. The couple went through all their pockets _________ their passports.

　 A. in honour of　　　 B. search for　　　 C. in search of　　 D. in memory of

34. Some pre-school children go to a day care center, ________ they learn simple games and songs.

　　 A. that　　　　　 B. there　　　　　 C. which　　　　 D. where

33. The waste can be recycled into new products, which _________ will save natural resources.

　　 A. in turn　　　 B. in return　　　　 C. in order　　　　 D. in time