Some people argue that using _____ nature to meet our own needs may spell disaster, unless we start to look around and understand how ______ clean environment benefits us all.

From news on education in Yunnan，we can sense that the problem of lacking resources is particularly __________ in rural areas.

This river is seriously polluted now,but once inside it ______. [ ]

With the launch of the Shenzhou VII spaceship last week, more and more Chinese people __________ of one day living on the moon

Why didn’t Mr. Smith arrive on time forthe meeting— He must have been ________ on his wayhere in the traffic jam.