根据句意，用所给词的正确形式填空。

1. We were all surprised at his _____ (arrive). We thought he wouldn't come.

2. I told myself _____  (calm) down since was still alive.

3. We must prevent people _____ (cut) down trees.

4. What a _____  (sun) day it is today!

5. Everyone should know the _____ (important) of protecting the wildlife.

依次填入下列各句横线处的词语，最恰当的一组是______．①有了点成绩就骄傲是不对的，______我们在工作中还有很多缺点．②这个城市交通拥挤的情况日益严重，许多人认为采取货车在规定时间内不准进入城区的措施______不是一个缓解矛盾的办法．③______平时注意积累，梳理各科知识，考试中才可能稳操胜券．

A．况且未尝只有

B．况且未尝只要

C．而且未免只要

D．而且未免只有