Anh chị ơi giải hộ em bài này với ạ

51. I have never been to the ballet before. ⇨ It is ______________________________________________________________ 52. John and Mary moved to Edinburgh twenty years ago. ⇨ It is ______________________________________________________________ 53. The police started looking for him two months ago. ⇨ For two months now the ______________________________________________ 54. I have never seen a dirtier-looking dog. ⇨ This is ____________________________________________________________ 55. Mary rang hours and hours ago. ⇨ It it hours ___________________________________________________________ 56. It is ages since Alan visited his parents. ⇨ Alan _______________________________________________________________ 57. John has not had his hair cut for over six months. ⇨ It is ________________________________________________________________ 58. I has never seen such a beautiful building. ⇨ It's the most _________________________________________________________ 59. I have never read such a romantic story. ⇨ This is the most ______________________________________________________ 60. They had never had such a cold winter. ⇨ It was the ___________________________________________________________ 61. You will never meet anyone more dangerous than Mrs Jones. ⇨ Mr. Jones is the most __________________________________________________ 62. Man has never had such efficient servants as computer. ⇨ Computer is the most __________________________________________________ 63. I haven't played football since 2000. ⇨ The last time _________________________________________________________ 64. I haven't been to HCM city for 2 years. ⇨ The last time _________________________________________________________ 65. I 've never met such a famous person before. ⇨ It is the first time ______________________________________________________ 66. She hasn't seen that boy here before. ⇨ It is the first __________________________________________________________ 67. She hasn't written to us since last year. ⇨ The last time _________________________________________________________ 68. She started to learn English 8 years ago. ⇨ It’s _________________________________________________________________ 69. He hasn't laughed so much for ages. ⇨ It’s _________________________________________________________________ 70. I haven't enjoyed myself so much for years. ⇨ It’s _________________________________________________________________ 71. The telephone rang for hours. ⇨ It’s hours ____________________________________________________________ 72. I haven't seen him for ages. ⇨ It’s _________________________________________________________________ 73. I have learned English for four years. ⇨ We started ___________________________________________________________ 74. Ly’s father started to stop smoking last year. ⇨ Ly’s father ___________________________________________________________ 75. The editor hasn’t written to Mai for a month. ⇨ The editor last _________________________________________________________ Giúp em với em sẽ tặng ctlhn em cảm ơn

Giải phương trình lượng giác sau : tan3x = tanx

giúp mình với các bạn ơi @@@@@@@

Làm hộ mình bài này Nguyên tử của nguyên tố x có tổng số hạt là 60 trong đó hạt mang điện nhiều hơn hạt không mang điện là 20 hạt có trong nguyên tử x xác định x là nguyên tử có nguyên tố hóa học

Giúp mk với chỉ có mỗi 1 câu trắc nghiệm thôi :<

Giúp mik vs m.n ơi. Năn nỉ lun á

giúp mình với ạ, cần gấp lắm ạ :( mình cảm ơn

Giúp mình với ạ , hứa vote 5* cả câu hỏi này và 10 câu hỏi khác ạ

Ở cà chua gen A quy định quả đỏ , gen a quy định quả vàng , gen B quy định quả tròn , gen b quy định quả bầu dục . Khi cho lai giống quả cà chua đỏ , tròn vs quả cả chua vàng , bầu dục . Ng ta thu được toàn quả đỏ tròn . Tiếp tục cho F1 giao phấn với nhau thu được F2 . Hãy vt sơ đồ lai từ P đến F2