Peter is_________ about the world around him and wants to know everything about it.

The war against Iraq and the suffering _____caused have become a big concern all over the world.

___ is really hard ___ them to climb Mount Tai.[ ]

Is this ruler Mary’s?——No, it _______Mary’s. Hers is on the desk..

Do you know the boy ____ is playing soccer there?—Certainly, he is a friend of my _____