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.