2 . 从方框中选择恰当的词或短语并用其正确的形式填空（每个词或短语只能用一次）。

serious;             blind;             cut down;             come down;             on business; cut in;             turn off;            give up;               put in;                       work closely with

1. My father is __________ in Hainan and will come back tomorrow.
2. The old tree _________ by the gardener the other day because of the disease.
3. —Susan, I called you at 5 p. m. yesterday. You didn’t answer it.
—Well, I _________ a light in my bedroom.
4. The ORBIS doctor, Mr. Li, will give students a talk about _________.
5. We can save energy by _________ the lights when we leave a room.
6. It is rude for us _________ on other people when chatting.
7. Never _________ on your way to realize your dream.
8. Look out! The bricks _________ from the tall building.
9. To win the game, the members become much _________ about the training.
10. Over the years, our school _________ the community to do more voluntary work.