1 . We’re in no doubt that the environment ________(improve) by our efforts to reduce pollution.

3 . 你为什么不尽力提升自己，而不是灰心丧气?
Why not try your best ________________________?

4 . 这篇文章告诉我们颜色的力量如何改变我们的心情并且改善我们的生活。
The article tells us how _______________ can change our moods and ____________ .

5 . 你都做了些什么来帮助贫困地区的人们改善生活?
____________________________________________________________________

7 . knowledge,   history,   books,   my，the,   past,   of， improve

___________________________________________________________.

8 . —The prices of vegetables and meat have ________ so quickly these days.
—So they have. Life is becoming harder.

A．raised

B．increased

C．improved

D．developed

9 . We must ________ (make sth. better) ourselves to provide higher service quality for others.

10 . Could you help me ________ (make something better) my speaking and writing?