Lập CTHH của hợp chất tạo bởi:

a. Silic (hóa trị IV) và oxi;

b. Sắt( III) và O

c. Nhôm và nhóm OH 

d) Fe (III ) và Cl ( I );

e) Al và nhóm (CO3) 

f) Ca và nhóm (SO4);

g) N ( IV ) và O ; 

Gấp giúp em ạ em cảm ơn

I. Rewrite following sentences, using the given words.

1. Tam doesn’t type as fast as she used to.

-> Tam used………………….....………………………………….

2. Learning English is very interesting.

-> It's ............................................................................................

3. Could you give me the bag?

-> Would you mind ..........................................................................

4. Why don’t we go to the movies this weekend?.

-> What about ……......................………………………………?

5. The picture is very expensive.

-> What an ………………..........................……………………!

6. Children like cartoons more than newsreels.

-> Children prefer .......................................................................

7. The apartment is big. The rent is high.

The bigger ………………………………………………….

8. The children are excited with the difficult games.

-> The more ……………………………………………….………

9. More and more people love to live in the countryside than in cities.

->More and more people prefer ……………………………………………….……….

10. It is more difficult for people to find jobs in the countryside than in the cities.

-> People find it ……………………………………………….……….