1. — What is she doing?

    — She is baking a cake.

2. — What are the students doing?

    — They are tidying up the classroom.

3. — Why not wash the dishes? 

    — Because there is something wrong with the sink.

4. — What is the cat doing?

    — It is running after the mouse.

5. — What is your neighbour doing?

    — He is dealing with the bad road.