Each sentence has one verb in Past Simple and one verb

Each sentence has one verb in Past Simple and one verb in Past Continuous. Open the brackets and write the verbs in the correct tenses.

1) He
(sit) on the floor when his mother
(come) into his room.

2) My friend
(paint) the door when someone
(knock).

3) I
(watch) TV when you
(ring).

4) Jane
(eat) the meat when Jake
(notice) her.

5) My mom
(study) in the University when she
(marry) my dad.