Chuyển sang bị động :
1. They needn’t use their motorbikes here. ………………………………………………………………………………………...
2. Huong need to wear the helmet when she drives the motorbike.
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3. Did they need to know my salary?
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4. Need I read the questions carefully?
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5. He doesn’t need to take everything along.
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6. They didn’t find anything in the room.
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7. Do you throw anything in the bin?- Yes, I throw my used papers. 
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8. Can you see anyone in the classroom?- I need to check it.
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9. Don’t look at anyone’s papers when you do the tests.
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10. Smoke filled the house. ………………………………………………………………………………………...