16. I’m looking forward to 　　　　(hear) from you.

15. Students should not spend too much time 　　　(play) computer games.

14. The discovery of the new evidence led to the thief 　　　　　　(catch).

13. The key to 　　　(solve) the problem is to meet the demand made by the customers.

12. I want to tell my father that our computer needs 　　　　　(repair).

11. I advise 　　　　　(leave) early and forbid Tom　　　　　 (follow).

10. I remember to mail the letter but forget 　　　　(buy) the stamp.

9. 　　　　(expose) to sunlight for too much time will do harm to one’s skin.

8. Peter had great difficult in 　　　　　(communicate) with others.

7. Seeing the scene, I can’t help　　　　 (laugh).