--- Haven’t seen you for ages! Where have you been? --- I have seldom had any chance to come back to the hometown ____ I was sent to Beijing ____ the project.
You will succeed in the end ________ you give up halfway.
Paul is good, kind, hard-working and intelligent; _____, I can’t speak too highly of him.
To improve their oral English, everyone in the class is supposed to ______ actively in these discussions.
Stronger and more lasting memories are likely to be formed ________a person is relaxed.
Nearly four hundred supermarkets in Beijing are preparing to dim(使暗淡) their lights ________ the "Earth Hour 2010" on Saturday night.