补全句子。
1. Do you _____ working _____ groups helpful?
2. My favorite English class activities are doing grammar _____ and _____ videos.
3. I prefer _____ class activities _____ a partner.
4. When I am working _____ a group, I take _____ and _____ the group.
5. I memorize new words better if I listen to them _____ and _____.
6. When I speak English _____ loud, I sometimes worry about _____ mistakes.
7. Before I say something in English, I think _____ it in Chinese, and then _____ it.
