Cho hình thang ABCD (AB // CD) AC cắt BD tại O a, CHỨNG MINH : OA=OB b, CHỨNG MINH OC=OD

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9. The man is our English teacher. He comes from Australia. (COMING) ......................................................................................................................................................................... 10. I found a man's wallet. He gave me a reward. (WHOSE) ......................................................................................................................................................................... 11. This is the book. I'm looking for it. (FOR WHICH) ......................................................................................................................................................................... 12. The lady gave me good advice. I spoke to her an hour ago. (TO WHOM) ......................................................................................................................................................................... 13. Who was the last person who saw the young man alive? (TO SEE) ......................................................................................................................................................................... 14. Sai Gon Times was the only newspaper which appeared that day. (TO APPEAR) ......................................................................................................................................................................... 15. This is the second person who was killed in that way. (BE) .........................................................................................................................................................................