I have already done my homework, so I can go for a walk. (a) have done
We are having our lunch at the moment. (a) are having
They always watch this series on Fridays. (b) watch
You saw him some minutes ago. (b) saw
After he had brushed his teeth, he went to his bed. (a) had brushed
She had cooked dinner by the time her mom came home. (c) had cooked
We are going to the cinema tonight. (c) are going
The train arrives at 8 p.m. (b) arrives
I promise, I will buy it for you! (a) will buy
I am having my birthday party this week. (b) am having