I. Choose the best answer to complete these sentences. 51. Your mom has read this fairy tale for you many times, _______? A. has she B. does she C. hasn’t she D. doesn’t she 52. He seldom visits us, ________? A. does he B. doesn’t he C. has he D. hasn’t he 53. You’ve never been in London, _______? A. do you B. haven’t you C. have you D. don’t you 54. That’s Bob, ______? A. is that B. isn’t that C. is it D. isn’t it 55. No one died in the accident, ________? A. did they B. didn’t they C. do they D. don’t they 56. Nothing is wrong, ________? A. isn’t it B. is nothing C. is it D. isn’t nothing 57. I’m supposed to be here, _______? A. am I B. are you C. aren’t you D. aren’t I 58. Everything is OK, _______? A. is it B. isn’t it C. is everything D. isn’t everything 59. Everyone took a rest, ________? A. did they B. didn’t they C. do they D. don’t they 60. Going swimming in the summer is never boring, _______? A. isn’t it B. is it C. does it D. doesn’t it 61. Let’s dance together, _______? A. shall we B. do we C. don’t we D. will we 62. Don’t talk in class, ________? A. won’t we B. do we C. will we D. don’t we 63. This picture is yours, ______? A. is this B. isn’t this C. is it D. isn’t it 64. Hoa never comes to class late, ______? A. does she B. doesn’t she C. does Hoa D. doesn’t Hoa 65. He hardly makes a mistake, _______? A. has he B. hasn’t he C. does he D. doesn’t he 66. Nobody cheated in the exam, ______? A. do they B. don’t they C. did they D. didn’t they 67. This is a beautiful girl, ________? A. is this B. isn’t this C. is she D. isn’t she 68. Let’s come back home, ________? A. will you B. won’t we C. shall we D. do you 69. I am not wrong, ______? A. am I B. aren’t I C. are I D. are you 70. He never gets up early, ______? A. doesn’t he B. does he C. has he D. hasn’t he 71. They rarely go to the cinema, ______? A. have they B. haven’t they C. do they D. don’t they Cảm ơn các bạn

Bài 5 : Chứng tỏ rằng : B = 1/2^2 + 1/3^2 + 1/4^2 +1/5^2 + 1/6^2 + 1/7^2 + 1/8^2 < 1

'Cố gắng làm tròn nhiệm vụ ta Bao giờ Nam Bắc một nhà' Nêu ya nghĩa câu này

làm hộ mik vs nhanhhhhhhhhhhhhhhhhhhhhh thank trc nha

lm cho cháu 1 kon như này ghi tên Phương Diễm nhó^^ Tone hồng

Viết chữ calligraphy " Lê Quỳnh Chi " nha!! Lưu ý: Đẹp, ko spam, ko vi phạm luật hỏi đáp, có kí, ko chụp = mt, ko app, ko ô li, ko kẻ ngang.

Ở thực vật, lượng nước do rễ hút vào được kí hiệu là A, lượng nước thoát ra là B. Trong trường hợp nào sau đây, cây bị mất cân bằng nước, héo lá và có thể chết A. A>=B B. A=B C. A>B D. A<B

thực hiện phép tính . a, 5^2 ×6^11 ×16^2+6^2 ×12^6 ×15^2 phần 2 ×6^12 ×10^4 -81^2 ×960^3. b,2^19 ×27^3 ×5 -15 ×(-4)^9 ×9^4 phần 6^9 ×2^10 -(-12)^10.

Ai giúp em giải ạ , em đang cần gấp , em cảm ơn trước ạ😙

Calli chữ:"Min" Đẹp vô nha có tramg trí xq,tradi nhá