1 . Would you like my old TV _________(交换)this camera?

2 . He studied hard before the examination, and it _______________(得到回报，取得成功). He made an A.

3 . The president spoke at the business meeting for nearly an hour without __________(参考)his notes.

4 . He escaped by                    (冒充为) as a guard.

5 . I’m very grateful that they helped me             (度过；挺过) the hard times.

6 . I have tried very hard to find a solution to the problem, but              (徒劳的).

7 .                   (追溯到) 1,500 years ago, the old temple comes back to life again.

8 . He sat by the window,                  (陷入沉思).

9 . The sound of happy laughter ______   _____(回忆起)memories of his childhood.

10 . I accepted the job _____   ____(毫不犹豫).