Trên cùng một mặt phẳng bờ chứa tia Ox, vẽ tia Oy và Oz sao cho góc xOy= 60, góc xOz= 120 a) Tính góc yOz b) tia Oy có phải tia phân giác của góc xOz không c) Gọi Ot là tia đối của tia Oy. Tính góc kề bù với góc yOz?

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Use the verbs in brackets to complete the sentences. Use the correct tense. 1. When I ......... (look) out of the window, I ...........(see) John. 2. ............ you ever ..................(play) the piano since you left school? 3. I ........... (not see) him for two days. 4. When he ...........(try) to open the door, he ........... (drop) his key. 5. They................. (live) in this house since 1987. 6. My father .............. (wash) his car while my mother and I ...................(prepare) dinner. 7. ................you .............. (meet) her yesterday? 8. Mary ............... (be) in London for three days. 9. The headmaster ............ (enter) the classroom when they .............(write) their exams. 10. He............. (buy) a new car last week. 11. I think that they.............. (arrive) tomorrow morning. 12. Last Wednesday they .......... (play) chess after they ............ (do) their homework. 1. When I ............ (look) out of the window, I ................ (see) John. 2................ you ever ............. (play) the piano since you left school? 3. I............(not see) him for two days. 4. When he ...........(try) to open the door, he .............. (drop) his key. 5. They ............ (live) in this house since 1987. 6. My father ............ (wash) his car while my mother and I ................(prepare) dinner. 7.................... you ...............(meet) her yesterday? 8. Mary .......... (be) in London for three days. 9. The headmaster ..........(enter) the classroom when they...........(write) their exams. 10. He...............(buy) a new car last week. 11. I think that they ............ (arrive) tomorrow morning. 12. Last Wednesday they ............ (play) chess after they .............(do) their homework.