用括号中所给单词的适当形式完成下列句子。

1. My brother is good at ___________. (draw )

2. I like to look at the colours of __________ in autumn. (leaf)

3. She doesn't like __________ food in the market because it's not fresh. (freeze)

4. He fell ___________ during the lecture yesterday afternoon. (sleep)

5. Don't forget to ___________ your email addresses at the end of the party. (change)

6. We are looking for students who can sing ___________. (beautiful)

7. There are many ___________ children in some African (非洲的) countries. (home)

8. ___________ the butter into the flour, please. (mixture)