Now the number of Chinese people working in Africa       more than one million.

Mr. Lee never said that he hated school when he was a child,       ?

____of the land in that district ____covered with trees and grass.

I think ______ of the materials I listened to at the beginning of the exam ______ easy.

—Remember that where and when two different English question words___________. —I see, but can you tell us how to use them, sir?