Betty sang the song ________ _________ _________(再三) last night.
How about ________ ________(处理) the problems?
We should ________ _________ _________(对……满意) our life.
Riding our bicycles to explore Beijing _________ ________(一定)great fun.
The teacher was able to ________ _________(使振作起来)the class by teaching them to sing lively songs.