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.