Children are always asking all kinds of questions because they are ______ about the world they live in.

_________you have a rich knowledge of Chinese history, try acting as a guide for these foreign visitors

the helpof Tian Sheng Yi Dui, many children have new school buses.—It sounds great.

With trees and grass_____ about 35％ of the urban area，the city of Hefei has taken on a new look.

It is getting cold. It’s ________ colder today than it was yesterday.