Past Simple vs Past Continuous

He (to stare) up at the ceiling, when I (to enter) his room.

He (to wash) his face when somebody (to knock) at the door.

I (to read) a book when I (to hear) the noise.

When she (to drive) her car, she (to feel) a headache.

When he (to wash) the dishes, he (to break) a plate.

When I (to meet) them in the yard, they (to laugh).

While Helen (to take) a shower mother (to wash) the dishes.

Why she (to sit) the whole day at home?

Yesterday the whole lesson we (to revise) grammar.

What you (to think) about when I (to ask) you a question?

What she (to play) when I (to ring) her up? - She (to play) the violin.

He (to sit) in the arm-chair and then (to begin) reading a book.

When I (to enter) the bar, I (to see) that they (to drink) coffee.

They (to have) supper when he (to visit) them.

When they (to see) their children, they (to play).