B.

Those are his books and pencils.

=>Those aren't his books and pencils.

=>Are those books and pencils him?

My father is an engineer.

=>My father isn't an engineer.

=>Is your father an engineer?

They are nurses.

=> They aren't nurses.

=>Are they nurses?

This is my brother.

=>This isn't my brother.

=>Is this your brother?

You are a teacher.

=>You're not a teacher

=>Are you a teacher?

She is my sister.

=>She isn't my sister.

=>Is she your sister?

 CĐPĐ và CĐPT là cái gì??

They are chairs.

What are they?

It is an armchair.

What is it?

His sister's name is Loan.

What is his sister's name?

My father is sixty-five.

What old is your father?

My mother is a doctor.

What does your mother do?/What is mother's job?

The students are in the classroom.

Where are the students?

There is one lamp in the room.

How many lamps are there in the room?

That is my friend, Lan.

Who is that?

There are forty students in my class.

How many students are there in your class?

Yes. These are my books.

Are these your books?

Có tất cả số cái bắt tay là : 

1 + 2 + 3 + ..... + 352 + 353 = 62481 ( cái bắt tay )

Đáp số : 62481 cái bắt tay

1+1=4