根据短文内容选择方框内的单词，并用其正确的形式填入空白处，使补全后的短文意思通顺，语法正确，结构完整。

I think it is easy to live a low carbon life if you want to make our life better. Here are some _____小题1:____ of advice: Travel by bus, bike or on foot as much as possible and ask our parents to drive as little as possible.

Plant trees as many as you can. Trees can help to make the air cooler in summer. ___小题2:____ the lights if it isn’t necessary to keep them on.

Don’t waste the water, oil, _____小题3:___ etc. Of course, there are many __小题4:______ things we can do in our daily life. After all, the earth is our common home. If everyone _____小题5:____ small changes, we can make a difference.

商业中心二级功能的功能分fm²为()

A.15

B.20

C.25

D.10