根据所给中文完成句子
1. —________ (哪一个教室) must we enter?
—Room 301.
2. The girl ________ (在中间) is my little sister.
3. We can use ________ (在左边的电梯).
4. We must ________ (保持安静) in the library.
5. Don't ________ (吃和喝) in the classroom.
6. ________ (在上学路上) she met an old friend of hers.
7. Look, he is standing ________ (在右边).
8. You can choose the one ________ (在你的前面).