用所给词的适当形式填空：

1. I don't believe she told us the_________. (true)

2. My deskmate looked _________, for he failed in the English test. (happy)

3. The old lady looked _________ at me. (angry)

4. Our government is doing something useful to solve the________ problems. (environment)

5. It's really ________ for a child of five to take care of himself. (possible)

6. The old man likes to live in a ________ place. Now he is sitting there ________. (quiet)

7. He is a _________ scientist. He comes from _________. (German)

8. The girl is the most _________ member in the school singing group. (act)

9. I am not used to the weather here. It is               . (change)

10. ________, I have just got enough money to buy the new CDs. (lucky)

11. Staying up at night is ________ to our health. (harm)

12. They will decide on ________ (suit) ways to help those ________ (home) people.