按要求改写下列句子
1. You mustn't leave rubbish on the ground. (保持原意不变)
________ leave rubbish on the ground.
2. We mustn't bring balls into the class building. (对划线部分提问)
________ ________ we do?
3. There isn't anything on his desk. (保持原意不变)
There________ ________ on his desk.
4. We have rules in the library. (改为否定句)
We ________ ________ rules in the library.
5. The book on the left is mine. (对划线部分提问)
________ ________ is yours?
6. They will take a train to Beijing. (保持原意不变)
They will go to Beijing ________ ________.
7. Parents will look at our noticeboard at 11 o'clock. (对划线部分提问)
________ ________ parents do at 11 o'clock?
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