(chuyển sang câu bị động ạ) 21. Someone is helping her with the hosework. 22. A pickpocket robbed me. 23. People don't use this roard very often. 24. A dog is chasing the child. 25. My friend sent me an invitation. 26. The farmer is building a new barn. 27. The secretary has given Mrs. Jones some letters. 28. We will grow a lot of trees in the parks. 29. Someone had broken our door down. 30. They chose him as the best actor of the year.

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