The Campaign of Occupying Wall Street is a reflection of the contradictions(矛盾) _____ exist in the society of the US. [ ]

You can keep the book for a further week provided that no one else 　　　　it.

On the top of the hill __________ the old man once lived.

Many people believe we will suffer from more environmental disasters _____we change the way we live[ ]

When______from the hill, thebuses look small[ ]