Each year __________ fishes are killed by the polluted water and many people are made sick by the polluted air .—-So we should do something to stop it .

The Qingming Festival which is also called______Pure Brightness Festival, falls on April 5 every year, it is______time-honored tradition(悠久的传统) for the Chinese to honor their ancestors.

Mum is ill in bed now. I must ____________ her.

you drive a car? —No, I can’ t.

The boy is _______ my sister, so he sits in front of her.