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chimchichbay
2 năm trước
Cho góc xOy khác góc bẹt .trên tia Ox lần lượt lấy 2 điểm B và C ,trên tia Ox lần lượt lấy 2 điểm A và D sao cho OA=AB ,OD=OC .Gọi I là dao điểm cua AC và BD . CM:a)tam giác OBD=tam giác OAC , b)AI=IB ,c) OI là tia phân giác của góc xOy
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II.Complete the sentences. Use the correct word in parentheses. 1.He felt sick……………he had eaten too much. ( because / so) 2.He didn’t study ………….he failed the test. ( because / so) 3.His car didn’t start ………….the battery was dead. ( because / therefore) 4.Solar energy is clean ………….almost endless.( and / but) 5.I sent her three letters,………………she didn’t reply. ( or / but) 6. I will tell you my plans…………….we are having dinner. ( while / or / because) 7.I enjoy learning English ………………I find it very difficult. ( but / so / or) 8.Her hobbies are watching TV……………….playing games. ( and / although / or) 9.The course was cancelled ……..There were very few students registering for it. ( so / because / but) 10. The weather was cold ; ……….. ,she wore a sweater.( so / therefore / because)

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