---What’s the low-carbon(碳) life style like?----Save        energy, produce            carbon. 

---You see, there are a lot of cars and people on the street. ---Yes, it’s very______.

If you want to be ___________, please keep ____________ every day.

----Peter is ________ than you, right?----Yes, but he is ________ runner in our class.

The price of this computer is the __     __ of the three.