Thì Quá Khứ Tiếp Diễn — Bài Tập 2

I bumped into an old friend while I ___ for the train.

The artist ___ painting a portrait.

The politician ___ his speech when a protestor interrupted him.

What ___ they discussing so loudly?

It ___ getting dark outside.

I ___ if you'd be free to talk later this afternoon.

He ___ sleeping when the doorbell rang.

I ___ reading a book when you called me.

The train ___ moving slowly out of the station.

The detective knew the suspect ___ the truth.