giúp mình bài này nha : Dạng bài tập : HTHT QKĐ : 1. I last ate raw fish when I was in Japan.  I haven’t __________________________________________________________________ 2. It's years since Mary last spoke French.  Mary hasn’t ________________________________________________________________ 3. It's ten weeks since since I last had a good night sleep.  I haven’t __________________________________________________________________ 4. He last paid taxes in 1970.  He hasn’t _________________________________________________________________ 5. I last ate meat 5 years ago.  I haven’t __________________________________________________________________ 6. It's 3 months since since the windows were cleaned.  The windows haven’t ________________________________________________________ 7. It's years since I took photographs.  I haven’t __________________________________________________________________ 8. I last watched TV on new years's day.  I haven’t __________________________________________________________________ 9. It's 3 months since he wrote to me.  He hasn’t _________________________________________________________ 10. The last time I was aboard was in the summer of 1978.  I haven’t __________________________________________________________ 11. It's ten years since that house was lived in.  That house ________________________________________________________ 12. I haven't seen him for 2 months.  I last _____________________________________________________________ 13. I haven't been to a concert for over a year.  The last time ____________________________________________________ 14. The last time I really enjoyed myself was your birthday party.  I haven’t ________________________________________________________ 15. It's nearly 20 years since my father saw his brother.  My father hasn’t __________________________________________________ 16. When did you learn to drive?  How long is it ____________________________________________________ 17. The last time I went swimming was when we were in Spain.  I haven’t ________________________________________________________ 18. You haven't tidied this room for weeks.  It’s weeks _______________________________________________________ 19. We started looking for a flat 2 months ago and we are still looking.  We have ________________________________________________________ 20. This is the first time I've been to a night club  I haven’t ________________________________________________________ 21. They have never heard such a thing before.  This is the first time ________________________________________________ 22. Noone has challenged his authority before.  This is the first time ________________________________________________ 23. She left university 2 years ago  It is _____________________________________________________________ 24. My mother was the most warm-hearted person I've ever known.  I have ___________________________________________________________ 25. I haven't been able to see them for over a year.  It is _____________________________________________________________ 26. It stared to rain at 2 o'clock.  It has ____________________________________________________________ 27. I have never been to the ballet before.  It is ______________________________________________________________ 28. John and Mary moved to Edinburgh twenty years ago.  It is ______________________________________________________________ 29. The police started looking for him two months ago.  For two months now the ______________________________________________ 30. I have never seen a dirtier-looking dog.  This is ____________________________________________________________

Rút gọn các biểu thức sau giúp mình 2 câu khoanh tròn nha mng

Mọi người giúp em vs ạ tra mạng cũng đc

* Bài 5: Trong tế bào của 1 loài trên phân tủ ADN có 3 gen kí hiệu là a,b,c có chiều dài bằng nhau. Gen a có tổng số lk H là 1900. Gen b có số nu loại A nhiều hơn số A của gen a là 80 và ít hơn gen c là 10. Khi các gen trên cùng nhân đôi 4 lần liên tiếp môi trường nội bào cung cấp tất cả 67500 nu tự do. a, Tính chiều dài của các gen a,b,c b, Số lượng nu từng loại môi trường cung cấp cho 1 gen nhân đôi 3 lần

Viết Calli: Anh cute thế mà lại matday vô cùng Anh chọc em tuk nhưng...... Em chỉ có thể hôn anh cho đỡ tuk NL: Tuk lắm r nha

Vẽ anime lười. 🥺👉👈 Một bức sì trét nho nhỏ mới ra lò. Hong biết khi nào mới full line được ở trên app. =((

Giải phương trình sau: x^2 + (9x^2)/(x+3)^2=7

ai cho tui vô nhóm với :< VẼ CON CHÓ HÌNH ẢNH SEMI NHÉ

Giải thích hộ mình với ạ, ct Đenta kiểu gì v ạ :v Chỗ dưới p^3 là 27 ạ

Vẽ mầm theo tâm trạng của bn NL : Bữa nay tâm trạng k tốt tí nào T_T