a) He is driveing his car to the farm.

b) The student are waiting for their teacher.

What are you going to do in the vacation?

They are listening to music now.

People are reading book now.

She isn't playing badminton now.

Her isn't listening to music now.

My father is reading book now.

The longest river in Vietnam is Mekong river

T​ỉ số giữa tuổi bố và tuổi Nam là :

​1/8:1/2=1/4

​Coi tuổi Nam là 1 phần thì tuổi bố là 4 phần như thế .

​Tuổi Nam là :

​30:(1+5)=5(tuổi)

​Tuổi bố là :5 *4 = 20

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