Chuyển sang câu bị động ----- Nội dung dịch tự động từ ảnh ----- 21. Scientists carried out researches on SIDA two years ago. 22. I will arrange everything in time. 23. We haven't moved anything since they sent you away to cure you. 24. She fell into water because somebody pushed her. 25. What ought we to do about this? 26. It is time they brought the cows in. 27. What questions did the examiner set? 28. Somebody must do something for these poor men.