Cho tam giác ABC vuông cân tại A.Trên cùng một nửa mặt phẳng bờ BC có chứa điểm A kẻ các tia Bx, Cy cùng vuông góc với BC. Trên cạnh BC lấy điểm M( M khác B, C). Đường vuông góc với AM tại A cắt Bx, Cy lần lượt tại H và K. a) Chứng minh: BM=CK. b) Chứng minhrằng: A là trung điểm của HK. c) Gọi P là giao điểm của AB và MH, Q là giao điểm của AC và MK. Chứng minh: PQ//BC.

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II. Use a relative pronoun to combine each pair of the sentences. If the relative pronoun can be omitted, write it in brackets. 1. Professor Wilson is an excellent lecturer. He teaches Chemistry. __________________________________________________________________________ 2. The man is a famous actor. You met him at the party last night. __________________________________________________________________________ 3. There are some words. They are very difficult to translate. __________________________________________________________________________ 4. The student writes well. I read her composition. __________________________________________________________________________ 5. Jim’s sister is a famous architect. You met her yesterday. __________________________________________________________________________ 6. I received two job offers. I accepted neither of them. __________________________________________________________________________ 7. I was looking for a book this morning. I’ve found it now. __________________________________________________________________________ 8. Mrs Smith does volunteer work at the hospital. She is a retired teacher. __________________________________________________________________________ 9. I live in a dormitory. Its residents come from many countries. __________________________________________________________________________ 10. Lake Prespa is a lonely beautiful lake. It’s on the north Greek border. __________________________________________________________________________