I_______ my homework when the door bell__________.

For the safety, everyone _________ obey the traffic rules when he is driving or walking.

I wanted to buy a comic book like yours but there were ______ left at the bookshop.

Have you seen the funny movie Let the Bullet（子弹）Fly?— Yes, it made me _________ many times.

My best friend visited my house while I __ __ dinner in the kitchen.