根据句意，用括号中所给词的正确形式填空。

1. He is very young but he looks _____ (health).

2.－When did he _____the game _____ (design)?

   －In 2005.

3. Nothing in the world is _____ (possible) if you put your heart into it.

4. We are told _____ (not laugh) at the people in trouble.

5. No matter where we are, We should do something _____ (use).

6. One word can have several _____ (mean).

7. Half a century _____ (pass) since he came to China.