His wife is usually bringing him sandwiches at lunch time.

--> He (a)  

The Prime Minister is making a speech at the moment.

--> A speech (a)  

She isn’t giving us more information at the moment.

--> We (a)  

He isn’t preparing everything for the presidential election.

--> Everything (a)  

I am not translating an article into Vietnamese.

--> An article (a)  

They are repairing the engine of the car in the garage.

--> The engine of the car (a)  

Nam are visiting the museum with his friend at the present

--> The museum (a)  

7. They aren’t making tea with cold water.

--> Tea (a)  

Nam and Hoa are painting this house and these cars for Halloween.

--> This house and these cars (a)