China ________ the developing countries in the world .
—What’s the matter _______Mike? He is wet through.—His car ran _______the river.
Please ask ________ not to skate on the thin ice. It’s very dangerous.
Wouldn’t it be ______ wonderful world if we could live in ______ peace?
—Why did Sarah cry just now?— She wanted a toy, _____ I can’t afford.
You’d better keep ______ when I take photos for you.