Foot: feet

Person; people

Child: children

Fish: fish

Sheep: sheep

Woman: women

Man: men

Ox: oxen

Tooth: teeth

Flamingo: Flamingoes

1. He is an architect: ...................................

They are architects.

2. That is a telephone:..............................

Those are telephones.

3. I am a traslator:...........................

We are translators.

4. It is a bookcase:.........................

They are bookcases.

5. I have a brother:.........................

We have brothers.

6. An enginneer works in a company:.................................

Engineers work in a company.

7. There is a stool in the garden:...........................

There are stools in the garden.

8. He has a good caracter:........................

They have ood characters.

9. What is that? That is a bookshelf:.............................

What are those? Those are bookshelves.

 10. It is a fork? No, is isn't:...............................

They are forks? No, the are not.

Công thức tổng quát của Ancol no, mạch hở là :

A. R(OH)_n  

B. C_nH_{2n + 2}O_x  

C. C_nH_{2n + 2 – x} (OH)_x 

D. C_nH_{2n + 2}O  

C₂H₂Cl₂ có bao nhiêu đồng phân ?        

A. 1   

B. 2  

C. 4  

D. 3