1 . The old man exercises every day __________(improve) his health.

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

3 . We improved the situation by stopping factories from putting waste into the rivers. (对画线部分提问)
________did you________the situation?

4 . — The prices of food, clothes and houses have            so quickly these years.
— So they have. Life becomes harder.

A．increased

B．raised

C．improved

D．developed

5 . If all of us pull together, there must be something we can do __________.

A．improve the environment	B．to improve the environment
C．improving the environment	D．improved the environment