填入适当的介词
1. Don't be late ________ school. It's time ________ school.
2. Listen. They are reading ________ their teacher.
3. Listen ________ me carefully. I will tell you a story ________ English.
4. We must keep quiet ________ the library. Don't look ________ ________ the window.
5. The boy ________ the middle is my little brother.
6. You can use the one ________ the left. Can't you see?
7. Don't walk ________ the grass.
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