must/mustn't表达行为规范 — 英语词汇题
题目
Being a good student! 选择 must 或 mustn't 填空，并根据首字母和中文提示补全单词。
1. We m____ keep the classroom clean and t____（整洁的）.
2. You m____n't play on the road. It's d____（危险的）.
3. Students m____ f____（遵守）the school rules and listen to teachers carefully.
4. You m____n't talk l____（大声地）in the library.