Past Perfect or Past Perfect Continuous

She (to prepare) all the documents by four o'clock yesterday.

He understood that he (to make) some mistakes in his test.

When the mother came home Nick (to sleep) for two hours.

Mary told us that she (to cook) a good dinner.

We were tired because we (to travel) for a long time.

The train (to arrive) before we bought the tickets.

I felt tired after I (to paint) the walls of my room.

Grandma (to fall) asleep before her favourite soap opera ended.

When she opened the window she was happy to see it (to snow) lightly.

The match (to finish) when I reached the stadium.