By the time we (1)________old age most of us have (2)________ twenty years sleeping. Yet nobody knows why we do it. Most scientists believe that by resting our bodies, we allow time for (3)________ maintenance work to be done. Any (4)________ that there is can be put right more quickly if energy isn’t being used up doing other things. Sleep is controlled by certain chemicals. These build up during the day, eventually reaching peaks that cause tiredness. We can control the effects of these chemicals to some extent. Caffeine helps to (5)________us awake while alcohol and some medicines make us sleepy. By using electrodes, scientists are able to (6)________what goes on in people’s heads while they sleep .They have (7)________ that when we first drop off everything slows down. The heart (8)________ more slowly and our breathing becomes shallow. After about 90 minutes our eyes start to twitch and we go into what is called REM (Rapid Eye Movement) sleep, which is a (9)________that we’ve started to dream .You have dreams every night, even if you don’t remember them. There are many theories about why we dream, none of them conclusive. A lot of people say they have to have eight hours’ sleep every night while others seem to (10)________on a lot less . One thing’s for sure – we all need some sleep. Going without it can have some very strange effects. 1. A. arrive B. become C. reach D. get 2. A. passed B. used C. occupied D. spent 3. A. essential B. elementary C. needed D. main 4. A. harm B. suffering C. damage D. hurt 5. A. stay B. maintain C. make D. keep 6. A. exhibit B. study C. work D. think 7. A. seen B. researched C. watched D. discovered 8. A. beats B. hits C. moves D. trembles 9. A. clue B. proof C. sign D. signal 10. A. manage B. need C. get D. deal

Tìm đk và rút gọn nhé;-; Có duy nhất 1 câu th, giúp mk với

hơi ít điểm nhưng mn cố giải giúp em vs nha, thanks ạ. Ai đầu tiên đc 5 sao+ctlhn

pls help pls help pls help pls help

EX1: Rewrte the sentences 1) "What does Luke do at the weekend?" 2) "Where do your parents live?" 3) "Who do you go running with?" 4) "When does Lucy get up?" 5) "How much TV do you watch?" 6) "How many books do they own?" 7) "Where does John work?" 8) "What do the children study on Fridays?" 9) "Why do you study English?" 10) "Where is the post office?" EX2: Rewrte the sentences 1) "Where is he?" 2) "What are you doing?" 3) "Why did you go out last night?" 4) "Who was that beautiful woman?" 5) "How is your mother?" 6) "What are you going to do at the weekend?" 7) "Where will you live after graduation?" 8) "What were you doing when I saw you?" 9) "How was the journey?" 10) "How often do you go to the cinema?" 11) "Do you live in London?" 12) "Did he arrive on time?" 13) "Have you been to Paris?" 14) "Can you help me?" 15) "Are you working tonight?" 16) "Will you come later?" 17) "Do you like coffee?" 18) "Is this the road to the station?" 19) "Did you do your homework?" 20) "Have you studied reported speech before?"

38. Tom drives to work every morning. (by) ................. 39. How much meat do you want? (would) ............................. ..................................... 40. This box has twenty packets of tea. (there) .................................................................... giải hộ mình nha!!!

cảm nhận và suy nghĩ của em về 8 dòng cuối của đoạn trích Kiều ở lầu Ngưng Bích . Từ đó nêu nhận xét về nghệ thuật tả cảnh ngụ tình của Nguyễn Du

VII. Fill in the blank with a suitable word. Dealing (1) ……………….pressures and in middle school can (2) ……………….difficult. The pressure may be to take friends, earn good (3) ………………. , excel in sports or other activities, and deal with hectic schedules. More and more people are going to high school now and it is becoming tougher to get in. Middle-school students face (4) ………………. to keep their grades up every day. They are in a (5) ………………. with their peers to be the best and the brightest in everything. During the teenage years, children will (6) ……………….the pressure to grow up. No longer will they be able to act (7) ……………….a child and not worry about responsibilities. Their (8) ……………….should help them make this transition from a child to an adult easy and teach them to (9) ……………….wise decisions. Prepare them for the world ahead of them and don’t let go completely at (10)………………. . Gradually let the growing up occur. XI. Complete the second sentence so that it has a similar meaning to the first sentence, using the word given in bold. Do not change the word given. 1. Charles and his father are exactly alike in appearance. (looks) => Charles ………………………………….his father. 2. Take all your possessions and walk slowly to the exit. (belongs) => Take everything …………………………………………..and walk slowly to the exit. 3. I’m finding it really enjoyable to work here. (enjoying) => I ………………………………………………………………..here. 4. I take work home regularly because of my new responsibility at work. (means) => My new responsibility at work ……………………………………………….work home regularly. 5. In my cycling group there’s George, Tom, Harry and me. (consists) => My ………………………………………………………….George, Tom, Harry and me. 6. In your opinion, who’s going to win the Cup? (think) => Who do …………………………………………………….win the Cup? 7. I’m seeing how wide the door is. (measuring) => I ……………………………………………………….the door. 8. Neil always forgets his wife’s birthday. (remember) => Neil ………………………………………………..his wife’s birthday. 9. Its ability to catch fish is the key to the polar bear’s survival. (depends) => The polar bear’s ………………………………………………………to catch fish. 10. What’s on your mind at the moment? (thinking) => What ……………………………………………………………..at the moment?

Cân bằng phương trình bằng electron FexOy+H2SO4 tạo thành Fe2(SO4)3+SO2+H2O Giúp mk vs cần gấp

$\text{Viết CTHH:}$ `OH, Cl, SO_4, PO_4, NO_3, Ca, Na, Al, NH_4.`