1. FeS2 -> SO2 -> SO3 -> H2SO4 -> CuSO4 -> Cu -> CuCl2 -> Cu ( NO3)2

I . Tag question . Add sultable question tags to the following sentence

1. He has no chance of finding a cheap flat in the city centre,...........?

2. Have a nice holiday,.........?

3. Get out your books,............?

4. Have some more coffee,...........?

5. Post this letter for me,...........?

6. Don't forget to keep in touch with us,...............?

7. Pass me the salt,...........?

8. Help yourself to this soup,...........?

9. Don't be late,...........?

10. Let's go out for a meal together one day,...............?

1. I would prefer you to do your homework

-> I'd rather

2. I don't have enough money to travel around the world

-> I wish

3. Kate said to Simon, " How about going to the cinema next week?"

-> Kate suggested

4. People believed that he was killed by terroist

-> It

5. This is the first time I have ever drunk coffee

-> I

6. fact/ In/ listen/ is/ as/ it/ UNESCO/ a/ Site / Heritage/ World

1. " Why don't you study harder?"

-> She

2. 'I would buy that computer if I were you "

-> She

3. " What a nice had you have!"

-> He

4. " Well done, Tina. You've won the ping pong championship "

-> Tina's friend

5. " When did you start working in this school?"

-> How long is it

6. " Why didn't you go to work today?"

-> He wanted to know

7. Van often watches Peter play baseball

-> Peter

8 when did you start to work in that factory?

-> How long

9. Lan dosen't know how to make a cake

-> Lan wishes that

10. You should take exercise regularly because that's the way to keep fit

-> If you want

1. " Would you like to come and visit me next summer, Lan"

-> Maryam invited

2. " Go on, participate in the singing competition, " said my father

-> My father encouraged

3. " Shall I give you a ride to the station?"

-> He offered

4. " Why don't you book a package holiday in advanced, Peter?"

-> Mary advised

5. We are interested in playing games after school

-> We find it

6. The test was not easy enough for us to get good grades

-> The test was not

-> It was such

7. I think surfing the web is useful

-> I find

8. People can buy newspapers almost everywhere

-> Newspapers

9. What type of clothing do you like most?

-> What is

10. Jeans are always fashionable

-> Jeans have never

1. Mai said, " I can not go to the movies with you, Nam"

-> Mai told Nam

2. Mrs Pike said to me, " I need you to help me with his machine today"

-> Mrs. Pike told me

3. My friend said to me, " You can use my phone if you need it"

-> My friend said to me

4. " I must stay at home tonight to finish my homwork" Jack said

-> Jack said that

5. The men asked Mary, " How long have you waited for this doctor?"

-> The men asked Mary

6. The teacher asked me, " Are you interested in learning English?"

-> The teacher asked me

7. Jim said, " Shall we go out for dinner?"

-> Jim asked his friends

7. These men said to, " Can you help us with these suitcaaes?"

-> These men asked me

8. I asked my cousin," Do you love reading books in this library?"

-> I asked my cousin

9. Helen asked that child, " Are you going to visit your aunt tomorrow?"

-> Helen asked that child

10. Jim said, " Do you want me to type your report, Susan?"

-> Jim asked SuSan

Cho tam giác ABC vuông tại A , có đường cao AH. Gọi E, F là trung điểm của AH, BH. Cho AB = 15cm , AC = 20cm .

a) Tính BC , AH , HC

b) Chứng minh : BF.EC = FA.AE

c) CE cắt AF tại I, EF cắt AC tại N. CM: AF vuông góc với CE và tính độ dài EN

Vẽ hình hộ e ạ

1. My sister used to be the best singer when the was young

-> Now my sister

2. My aunt used to live in Ha Noi 3 years ago

-> Now my aunt dosen't

3. You must pay attention to the lesson or you won't understand it.

-> If

4. You are always making noise

-> I wish

5. Read many kind of books and you'll widen your knowledge

-> If

6. " Do you like learning English "

-> The examiner asked me

7. Mrs.Green stopped working as a TV presenter in 2010

-> Mrs.Green has

8 He said to me," What language can you speak ?"

-> He asked her

9. " I home it will rain tomorrow" The farmer said

-> The farmer said

10. They are going to celebrate their wedding anniversary next Sunday

-> Their