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.