Cho tam giác ABC , đường cao AH . Gọi M là trung điểm của cạnh BC . Qua M kẻ các đường thẳng song song với AB và AC , chúng cắt các cạnh AC và AB theo thứ tự tại E và D .
a) Cmr : Tứ giác ADME là hình bình hành . Gọi O là giao điểm của AM và DE . Cmr : Tam giác OAH cân .
b) Tứ giác tạo thành từ 4 điểm D , E , M , H là hình gì ? Tại sao ?
c) Tìm điều kiện của tam giác ABC để tứ giác ADME là hình chữ nhật .
Trong trường hợp này hãy xác định vị trí của điểm M trên cạnh BC để độ dài đoạn thẳng DE nhỏ nhất

điền so,too,neither,either  thàn câu

11. They have to go now, and (MY DAUGHTER)

12. The men don’t take it, and (WE)

13. I like no one, and (SHE)

14. They must have gone, and (SHE)

15. The man who told me about that looked nice, and (YOU)

16. He put it away, and (YOU)

17. They couldn’t swim, and (I)

18. Mrs Brown won’t be late, and ( THEY)

19. My mother’s come, and (MY GRAND PARENTS)

20. She’d rather stay, and (I)

mn nhanh nha mk vội lắm 

tickkkkkkkkkkkkkkkkkkkkkkkkk

hai quả cầu bằng kim loại có khối lượng bằng nhau được treo vào hai đĩa của một cân đòn. Hai quả cầu có khối lượng riêng lần lượt là D1 = 7,8g/cm3; D2 = 2,6g/cm3. Nhúng quả cầu thứ nhất vào chất lỏng có khối lượng riêng D3, quả cầu thứ hai vào chất lỏng có khối lượng riêng D4 thì cân mất thăng bằng. Để cân thăng bằng trở lại ta phải bỏ vào đĩa có quả cầu thứ hai một khối lượng m1 = 17g. Đổi vị trí hai chất lỏng cho nhau, để cân thăng bằng ta phải thêm m2 = 27g cũng vào đĩa có quả cầu thứ hai. Tìm tỉ số hai khối lượng riêng của hai chất lỏng
help me !!! ai nhanh nhất mình tick ( VẬT LÍ 8)

1 'Could you get there and back in one day?' I asked. (I asked if he . . .)
2 1 can't open this tin,' said Ann. 'Shall I do it for you?' said Tom.
3 'Could you translate this for me, please?' I asked the official.
4 'Shall we ever meet again?' he wondered.
5 'Will you be here tomorrow?' she asked. 'Yes,' I answered.
6 'Could I lose five kilos in a week?' said the fat woman. 'No,' said the doctor.
7 'Will you have a drink?' he said.
8 'Why don't you install gas central heating?' said the advertisement. (urge)
9 'Will you read this very carefully, please?' he said to me.
10 'Shall I tell him what happened?' she asked me.
11 'Wouldn't you like to look ten years younger?' said the hairdresser.
12 I'm going to Brighton tomorrow,' said Ann.
'So am I,' said Tom. 'Would you like a lift?' (Tom said he was too and...)
13 'Can I have a sweet?' said the small boy.
14 'Can we stay up till the end of the programme?' said the children.
15 'Could I have the weekend off?' he asked his boss.
16 'Could I leave early on Friday?' he said.
17 'Why don't you like pop music?' the teenagers asked him.
18 'Why don't you take up the oboe again?' said my friends, (advise)
19 'Where shall I hang my new picture?' he said. 'Would it look well over the mantelpiece?'
20 'What shall I do if the car won't start?' I said.
21 'Have you got enough money? Shall I lend you some?' said my friend.
22 'Will you be able to guide me or shall I bring a map?' I asked.
23 'You won't forget to shut the door, will you?' she said. (remind)
24 'Would you like to see over the house?' I asked her.
25 'Would you like to peel the potatoes?' said Ann, handing me a knife.
26 I've got two tickets. Would you like to come with me?' he said.
27 'Can you use a word processor?' he asked. 'No,' I said.
28 'Would you mind living by yourself for six months?' they asked.
29 'Would you mind paying cash?' said my landlady when I took out my cheque-book.
30 'Why don't you trust him?' I asked Ann.

 'Could you get there and back in one day?' I asked. (I asked if he . . .)
2 1 can't open this tin,' said Ann. 'Shall I do it for you?' said Tom.
3 'Could you translate this for me, please?' I asked the official.
4 'Shall we ever meet again?' he wondered.
5 'Will you be here tomorrow?' she asked. 'Yes,' I answered.
6 'Could I lose five kilos in a week?' said the fat woman. 'No,' said the doctor.
7 'Will you have a drink?' he said.
8 'Why don't you install gas central heating?' said the advertisement. (urge)
9 'Will you read this very carefully, please?' he said to me.
10 'Shall I tell him what happened?' she asked me.
11 'Wouldn't you like to look ten years younger?' said the hairdresser.
12 I'm going to Brighton tomorrow,' said Ann.
'So am I,' said Tom. 'Would you like a lift?' (Tom said he was too and...)
13 'Can I have a sweet?' said the small boy.
14 'Can we stay up till the end of the programme?' said the children.
15 'Could I have the weekend off?' he asked his boss.
16 'Could I leave early on Friday?' he said.
17 'Why don't you like pop music?' the teenagers asked him.
18 'Why don't you take up the oboe again?' said my friends, (advise)
19 'Where shall I hang my new picture?' he said. 'Would it look well over the mantelpiece?'
20 'What shall I do if the car won't start?' I said.
21 'Have you got enough money? Shall I lend you some?' said my friend.
22 'Will you be able to guide me or shall I bring a map?' I asked.
23 'You won't forget to shut the door, will you?' she said. (remind)
24 'Would you like to see over the house?' I asked her.
25 'Would you like to peel the potatoes?' said Ann, handing me a knife.
26 I've got two tickets. Would you like to come with me?' he said.
27 'Can you use a word processor?' he asked. 'No,' I said.
28 'Would you mind living by yourself for six months?' they asked.
29 'Would you mind paying cash?' said my landlady when I took out my cheque-book.
30 'Why don't you trust him?' I asked Ann