Bài 1: Tính các góc của hình thang, biết: a) Hình thang ABCD là hình thang vuông có AB//CD, góc A= 90 độ, góc = 60 độ b) Hình thang MNPQ (MN//PQ) có góc M-Q=40 độ, góc N chia P= 4/5(góc N/P) Bài 2: Tứ giác ABCD có BC = CD và DB là tia phân giác góc D. Chứng minh rằng ABCD là hình thang và chỉ rõ cạnh đáy, cạnh bên của hình thang. Bài 3: Cho tam giác ABC vuông cân tại A, BC = 2cm. Vẽ về phía ngoài tam giác ACE vuông cân tại E. Tứ giác AECB là hình gì? Vì sao? Tính các góc và các cạnh của hình thang AECB. Bài 4: Cho hình thang ABCD, vẽ hai tia phân giác của góc B và góc C cắt nhau tại E. Chứng minh BE vuông góc với EC.

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III: Rewrite the following sentences: 1. He can’t go out because he has to study for his exam. => If………………….. 2. She is lazy so she can’t pass the exam. If………………………………………… 3. He will pay me tonight; I will have enough money to buy a car.( L 1) => If…………………………………. 4. He smokes too much; that’s why he can’t get rid of his cough. => If……………………………….. 5. She is very shy, so she doesn’t enjoy the party. => If……………………………………….. 6. I will get a work permit. I will stay for another month.( L1) => If…………………………… 7. He doesn’t take any exercises. He is so unhealthy => If……………………………………. 8. We can’t get the ticket because I don’t have the right change. => If……………………………………….. 9. Study hard or you won’t pass the exam.(L1) => If……………………….. 10. Don’t speak too fast or you will make mistakes.(L1) => If……………………….. 11. I don’t eat lunch, I feel hungry now. => If I…………..…………………………………. 12. I don’t come if they invite me. => Unless………………………………………………. 13. He is very tired, that’s why can’t go to school. => If he……………………………………………………… 14. He can’t walk now because he is too old. => If he………………………………………………. 15. Leave me alone or I’ll call the police. =>If………………………………………………………… 16. You don’t work, you will not get good salary. => Unless…………………………………………………. 17. The children don’t go to school because it rains heavily. => If it …………………………………………………… 18. He doesn’t have money, he can’t buy that computer. =>If he ………………………………………………… 19. You must tell me the whole truth or I won’t help you. => Unless………………………………………………… 20. The car breaks down so often because you don’t take good care of it. => If you took…………………………………………………………

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