gasoline,charges,commuting,electric car,the environment,air quality,pollution,coal,natural gas.
Hearing if
what will happen if....?
If i am late.I will call you.
If we buy an electric car,it will help the environment.
if the city changes to natural gas,air quality will improve.
if I finish my project,I can leave work early.
if i save my money,I can buy an electric car next year.
If factories stop using coal,they can decrease pollution.
Opinions about electric cars are changing.
Air quality has been improving for several years.
Pollution has been getting worse in our city.
Commuting is getting more irritating.
The city has been getting serious about using natural gas.
It‘s getting better all the time.Unit1-The future-Talking about the environment
原文：https://www.cnblogs.com/eistert37/p/14737100.html