3. come at　 袭击，向...扑来

2. come on / along　　 来吧，快点

1. come across　 遇见，发现

13. Searching through the drawer, I came _____ the letter I'd been looking for.

12. A child came _____ to me and showed me the way.

11. Someday you'll come _____ know the mistakes you have made.

10. This magazine comes _____ once a month.

9. The trees turn green and flowers come _____.

8. How long is it since the electronic computer came _____ use?

7. Lei Feng came _____ a poor peasant's family.