Change into passive voice. ----- Nội dung dịch tự động từ ảnh ----- 9. Are you going to mail these letters soon? 10. He should have finished the report yesterday. 11. Scientists began to carry out researches on SIDA two years ago. 12. They say that he is the richest man in our town. 13. I can assure you I will arrange everything in time. 14. We are to pity rather than despise these homeless boys. 15. We haven't moved anything since they sent you away to cure you.