With trees and grass ______39.6% of the urban area,the city of Weifang has taken on a new look.[ ]

oor man refers to a personwho spends __________ time on indoor activities, such as playing computergames, sleeping and watching sports on television.

One of Marx’s works written in English in the 1860s.　　

This summer North China was attacked by such a terrible heat few people has ever experienced before.

ing is thus an active, not a , behavior consisting of hearing, understanding and remembering.