3.What is Thu doing?

-Thu is washing her hair.

4.What are the girls doing?

-The girls are eating ice cream.

5.What are they doing?

-They are waiting for the bus.

6.What are those birds doing?

-Those birds is flying in the sky.

7.What is the boy doing?

-The boy is swimming in the river.

8.What is the man doing?

-The man is working in his office.

9.What is Ba doing?

-Ba is driving his car.

10.What are Mai and Lan doing?

-Mai and Lan are doing their homework.