Một mảnh vườn hình thoi có độ dài hai hai đường chéo là 9m và 6 m .Ở giữa vườn người ta xây một bể cá hình tròn bán kính 1,5m phần còn lại để trồng hoa .Tính diện tích phần vườn trồng hoa

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Bài tập viết lại câu thì hiện tại hoàn thành và quá khứ đơn 1. Samuel started keeping a diary in 1997.  Samuel has _______________________________________________________ 2. We started leaming English fìve years ago.  We have _________________________________________________________ 3. I began living in Ho Chi Minh City when I was 8.  I have ____________________________________________________________ 4. She has taught the children in this remote village for five months.  She started ________________________________________________________ 5. He has written to me since April.  The last time _______________________________________________________ 6. She hasn’t had a swim for five years.  She last __________________________________________________________ 7. They last talked to each other two months ago.  They haven’t ______________________________________________________ 8. The last time she saw her elder sister was in 1999.  She hasn’t _________________________________________________________ 9. She hasn’t written to me for years.  It’s years __________________________________________________________ 10. Robert and Catherine have been married for ten ỵears.  It’s ten years ______________________________________________________ 11. It’s two weeks since they deaned their room.  They ____________________________________________________________ 12. It’s over six months since John had his hair cut.  John _____________________________________________________________ 13. How long is it since you rode a bicyde?  When _____________________________________________________________ 14. How long is it since he wrote to ỵou?  When ____________________________________________________________ 15. When did he last talk to you?  How long _________________________________________________________ 16. When did you last telephone him?  Hong long ________________________________________________________ 17. We have never eaten this kind of food before.  It’s the ____________________________________________________________ 18. This is the fìrst time I have seen this fìlm.  I have never _______________________________________________________