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.
3的激发态，当它们跃迁时，有可能放出_______种能量的光子；在能级__________与能级_____________间跃迁时所发出的光子的波长最长，波长是_____________。 
