Nhận xét và giải thích tỉ số biến động giới tính khi sinh ở nước ta giai đoạn 1999-2019

Một xe khách từ Mỹ Đình đến Hạ Long mất 2 giờ. Một xe máy từ Hạ Long đến Mỹ Đình mất 3 giờ. Tính quãng đường từ Mỹ Đình đến Hạ Long biết vận tốc xe khách hơn vận tốc xe máy là 20 km/giờ. Nếu hai xe khởi hành cùng một lúc thì chúng gặp nhau tại một địa điểm cách Mỹ Đình bao nhiêu ki- lô- mét? Đáp số là 120 km ạ. Mk cần lời giải ạ.

M.n giúp mình nha đừng bỏ ,pleasee ! Trc 10h tối mình phải nộp r

thành tựu nào sau đây là thành tựu của công nghệ gen : A. tạo giống cây trồng tam bội B. tạo giống lợn lai giữa giống lợn ỉ và đại bạch C. tạo giống dê sản xuất protein sữa người D. giúp nhân nhanh giống cây trồng đáp ứng nhu cần sản xuất

1.Do you enjoy reading comic books ?=> Are you .........................? 2. We spend half an hour walking along the beach =>It takes................... 3.Whats the weight of your suitcase ?=>how much ................................? 4.Do you enjoy learning English ?=>Are you .................... 5.He"d rather play golf than tennis => He prefers..................... 6.keeping the environment clean is very inportant =>It is..................... 7. Lan is my sister => I 8. My father prefers watching films at home to going to the cinema .=> My father would ....................

Exercise 8: Read the situation and write sentences with should / shouldn't. Some of the sentences are past and some are present. 1. I'm feeling sick. I ate too much. I shouldn't have eaten so much. 2. That man on the motorbike isn't wearing a helmet. That’s dangerous. He should be wearing a helmet ;. 3. When we got to the restaurant, there were no See tables. We hadn’t reserved one. We................................ 4. The notice says that the shop is open every day from 8:30. It is 9 o'clock now but the shop isn’t open yet. It 5. The speed limit is 30 miles an hour, but Catherine is doing 50. She 6. I went to Paris. A friend of mine lives in Paris but I didn’t go to see him while I was there. When I saw him later, he said: You 7. I was driving behind another car. Suddenly, the driver in front stopped without warning and I drove into the back of his car. It wasn’t my fault. It should ..................................................... 8. I walked into a wall. I wasn’t looking where was going. I……………………………………

Exercise 6: Read the situations and make sentences with needn’t have. 1. George went out He took an umbrella because he thought it was going to rain. But it didn't rain. - He needn't have taken an umbrella . 2. Ann bought some eggs when she went shopping. When she got home, she found that she already had plenty of eggs. - She ……………………….. 3. A friend got angry with you and shouted at you. You think this was unnecessary'. Later you say to him/her. You ……………………….. 4. Brian had no money, so he sold his car. A few days after he won some money in a lottery. He ……………………….. 5. When we went on holiday, we took the camera with us but we didn’t use it in the end. We ……………………………………………… Exercise 7: Complete the sentences with should (have) + the verb in brackets. 1. Margaget should have passed the exam She's been studying very hard (pass) 2. You missed a great party ast night You should have come. (come) 3. We dont see you enough. You ......................and see us more often (Come) 4. I’m in a difficult position. What do you think I.......................................... ? (do) 5. I’m sorry that I didn't take your advice. I.......................................................... what you said (do) 6. I’m playing tennis with Jill tomorrow. She..........................................- she's much better than me. (win) 7. We lost the match but we .................................We were the better team (win) 8 "Is John here yet? "Not yet, but he ...................................here soon" (be) 9. I posted the letter three days ago, so it............................................................ by now. (arrive)

giặc Mông Thát tràn sang thì cựa gà trống không thể đâm thủng áo giáp của giặc, mẹo cờ bạc không thể dùng làm mưu lược nhà binh ; dẫu rằng ruộng lắm vườn nhiều, tấm thân quý nghìn vàng khôn chuộc, vả lại vợ bìu con díu, việc quân cơ trăm sự ích chi ; tiền của tuy nhiều khôn mua được đầu giặc, chó săn tuy khỏe khôn đuổi được quân thù ; chén rượu ngon không thể làm cho giặc say chết, tiếng hát hay không thể làm cho giặc điếc tai. Lúc bấy giờ, ta cùng các ngươi sẽ bị bắt, đau xót biết chừng nào! Chẳng những thái ấp của ta không còn, mà bổng lộc các ngươi cũng mất ; chẳng những gia quyến của ta bị tan, mà vợ con các ngươi cũng khốn ; chẳng những xã tắc tổ tông ta bị giày xéo, mà phần mộ cha mẹ các ngươi cũng bị quật lên ; chẳng những thân ta kiếp này chịu nhục, rồi đến trăm năm sau, tiếng dơ khôn rửa, tên xấu còn lưu, mà đến gia thanh các ngươi cũng không khỏi mang tiếng tướng bại trận. Lúc bấy giờ, dẫu các ngươi muốn vui vẻ phỏng có được không? Được trích từ văn bản nào

Exercise 5: Read the situations and use the words in brackets to write sentences with must have and can't have. Eg: 1. The phone rang but I didn't hear it (I/asleep). I must have been asleep . 2. Jane walked past me without speaking, (she/see/me). She can’t have seen me 3. The jacket you bought is very good quality, (it/very expensive) - ………………………………………………………………………….. 4. I haven't seen the people the next door for ages, (They/go away) - ………………………………………………………………………….. 5. I cant find my umbrella, (Weave/it in the restaurant last night) - ………………………………………………………………………….. 6. Don passed the exam without studying for It (me exam / very difficult) - ………………………………………………………………………….. 7. She knew everything about our plans, (she/ listen / to our conversation) - ………………………………………………………………………….. 8. Fiona did the opposite of what I asked her to do. (she/understand/what I said) - ………………………………………………………………………….. 9. When I woke up this morning, the light was on. (I forget/to turn/ it off) - ………………………………………………………………………….. 10. The lights were red but the car didn't stop, (the driver/see/the red light) - ………………………………………………………………………….. 11. I was woken up in the middle of the night by the noise next door (the neighbours/have/ a party) - …………………………………………………………………………..

Exercise 4: Rewrite the following sentences. 1/ It isn't necessary to shout.  You ............................................................................................ 2/ It wasn't necessary for them to call for help after all. They ................................................. 3/ There was no need for you to have gone to all that trouble.  You .......................................... 4/ Your house needs to be redecorated.  Your house.................................................................... 5/ It's possible that he didn't get my letter.  He might ................................................................. 6/ You needn't have bought it for me.  It wasn't ........................................................................... 7/ I'm absolutely sure that they didn't go out in that weather.  They can't ................................................................................................................................... 8/ "Why didn't you tell me about it yesterday ?"  You should .................................................... 9/ I'm sure she didn't do it on purpose.  She can't.................................................................. 10/ It's possible that your car was stolen.  Your car ................................................................ 11/ Perhaps Lan went to London.  Lan might....................................................................... 12/ It's a pity that you didn't go to see that film at the cinema last night.  You should .................................................................................................................................. 13/ "It was very careless of you to let the door open last night"  You shouldn't............................................................................................................................... 14/ Perhaps Manh is repairing his bike now.  Manh may........................................................ 15/ Perhaps they have two big houses in the suburb.  They ........................................................ 16/ You ought to have reminded me about the meeting yesterday.  Why didn't ...................................................................................................................................