1 . He was soon back on his feet in such a comfortable s________(环境) with so many beautiful trees and flowers. (根据汉语提示单词拼写）

2 . His first speech as president made a strong i________ on his audience. (根据首字母单词拼写)

3 . England is the largest of the four countries and for c________it is divided into three zones. (根据首字母单词拼写)

4 . The traffic slowed down because of the heavy snow in Yushu county, presenting a new __________ to the recovery from the earthquake.

A．suffering

B．disaster

C．challenge

D．damage