When or While

It began to rain ______ I was walking to school.

• when

• while

I was having lunch _____ the telephone rang.

• when

• while

We saw an accident ________ we were waiting for the bus.

• when

• while

___________ I was reading a novel, I heard a scream.

• When

• While

What were you doing ______ you broke your leg?

• when

• while

Sammy was waiting for us ________ we got off the plane.

• when

• while

___________ I was writing an email, the computer suddenly went off.

• When

• While

He was working in the garden _________ he hurt his back.

• when

• while

_________ you knocked at the door, I was doing my homework.

• When

• While

Tatang saw a pickpocket in action ________ he was standing on a crowded bus.

• when

• while