Cho lăng trụ đứng ABC A'B'C' có đáy vuông tại A, AB=a, góc ABC=60, CB' tạo với (AA'BB') góc 30 Tính khoảng cách AA' đén BB'

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Gỉai thích nha ạ 1. Where ___________you (live)____________? I (live)______________in Hai Duong town. 2. What he (do) _________________now? He (water)_________________flowers in the garden. 3. What _______________she (do)_____________? She (be)______________a teacher. 4. Where _________________you (be) from? 5. At the moment, my sisters (play)____________volleyball and my brother (play) ________________soccer. 6. it is 9.00; my family (watch)___________________TV. 7. In the summer, I usually (go)______________to the park with my friends, and in the spring, we (have) _____________Tet Holiday; I (be)________happy because I always (visit) ______________my granparents. 8. ____________your father (go)_____________to work by bus? 9. How ___________your sister (go)___________to school? 10. What time _____________they (get up)_________________? 11. What ____________they (do)________________in the winter? 12. Today, we (have)______________English class. 13. Her favourite subject (be)__________________English. 14. Now, my brother (like)_________________eating bananas. 15. Look! A man (call)_________________you. 16. Keep silent ! I (listen )____________________to the radio. 17. ______________ you (play)_________________badminton now? 18. Everyday, my father (get up)_______________at 5.00 a.m. 19. Every morning, I (watch)_________________tv at 10.00. 20. Everyday, I (go) __________to school by bike. 21. Every morning, my father (have) ______________a cup of coffe. 22. At the moment, I(read)_______________a book and my brother (watch)_______ TV. 23. Hoa (live)________________in Hanoi, and Ha (live)________________in HCM City. 24. Hung and his friend (play)_______________badminton at the present. 25. They usually (get up)___________________at 6. oo in the morning. 26. Ha never (go)___________fishing in the winter but she always (do)________ it in the summer. 27. My teacher (tell)__________________Hoa about Math at the moment. 28. There (be)____________________ animals in the circus. 29. _______________he (watch)______________TV at 7.00 every morning? 30. What _____________she (do ) _________________at 7.00 am? 31. How old _________she (be)? 32. How ___________she (be)? 33. My children (Go)________________to school by bike. 34. We (go)_______________to supermarket to buy some food. 35. Mr. Hien (go)________________on business to Hanoi every month. 36. Ha (like)______________coffee very much, but I (not like)______________it. 37. She (like )________________Tea, but she (not like)____________________coffee. 38. I (love)_______________ cats, but I (not love)__________________dogs. 39. Everyday, I (go)______________to school on foot. 40. Who you _________________(wait) for Nam? – No, I ___________ (wait) for Mr. Hai.