He _____the problem _____in his mind for a whole week before he did anything about it.
The house prices fell sharply at the end of last year, but ______ at the beginning of this year.
Sam has been appointed_____ manager of the engineering department to take _____ place of George.
.一You really appreciate John Lenon’s performances, don’t you? 一______ I just like his soft voice.
—Did you give your father _______? —Yes ,I advise he _______smoke .
Every possible means ___________but no one knows which is suitable .