Em hãy chuyển câu sau sang thể bị động

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1. A group of students’ friends have been met at the railway station.

2. Tom wasn't allowed to take these books home. 

3. Exercises won't be corrected by the teacher tomorrow. 

4. How many trees were cut down to build that fence? 

5. Many people are attracted by this well-known library. 

6. The meeting was attended by all students. 

7. He is said to be intelligent. 

8. My bike can't be repaired by him. 

9. Tom has been operated by Mary since 10 o'clock. 

10. This is the second time we have been written to about this by them.