根据句意和汉语提示，填写单词。

1. An old woman won five _____ (百万) yuan in the lottery ( * * 抽奖).

2. You look unhappy today. Please tell me your _____ (烦恼的事情).

3. His father was wearing a white shirt and a red ________(领带).

4. The book was the result of ten years of medical _____ (研究).

5. The famous singer gave much money to _____ (慈善事业) to help homeless children.