Trả lời nha
1. Letters are types in the office by Mary
2. You'll be helped by his father tomorrow
3. The human life has completely been changed
Science and technology
4. This bottle was broken by Peter
5. English is being learnt in the room
6. My mind can't be changed
7. I hadn't been told about it
8. Her telephone number isn't know
9. The children will be brought home by my students
10. I was sent a present last week
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