— is the World Cup held?— Every 4 years.
—That book I lent to you yesterday is ______than this one.—Really? I’ll return it to you as soon as I finish reading it.
A dog bit him and he was ______great pain.
I often hear the girl ______ beautifully next door. When I passed by the door, I heard her ______ just now.
I was doing my homework ______ my mother was cooking in the kitchen.
I was cleaning my bedroom. ______ a mouse came out.