根据句子意思和中文提示，拼写出正确的单词。

1. Emily does ______ (好) in math this term than before.

2. ______ (千) of Iraqi people became homeless in the war, which broke out in 2003.

3. He'll graduate from college in a few ---______ (月) time.

4. Yang Liwei with Shenzhou V returned ______ (安全) to the earth on Thursday morning

    after more than 21 hours' travel in space.

5. Though I have ______ (买) my bike for three years, it still looks new and works well.

6. Something has been done to stop the factory from ______ (污染) the environment around it.

7. Tomorrow is my friend's ______ (二十) birthday. I'll buy something special to surprise him.

8. Nobody could explain Saddam Hussein's ______ (失踪) until he was found again near his hometown.