Chuyển các câu sau sang câu bị động:
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VII. Turn into Passive voice: S+ can/must/ might/ should...+be+P2+by+ O
1
People should send their complaints to the head office.
2. You mustn't use this machine after 5.30 p.m
3. We can never find him at home for he is always on the move.
4. You must clean the wall before you paint it.
5. A sudden increase in water pressure may break the dam.
6. We must take good care of books borrowed from the library.
7. Must we finish the test before ten?
8. They can open this safe.
9. Someone might steal my shoes.
10. What time can the boys hand in their papers?