How do you go to school? Some students may answer， “By car”. Maybe some others will look at them through green glasses (羡慕地).
You         feel bad if you have no cars. It’s true that cars are        . Many people find it hard to think about        life will be like if they have no cars. But now more people know that too many cars bring great        . They make streets too        .
People are trying to stop pollution (污染) from cars. One way is to make             cars. But it         much money to make these cars. And more people think about better ways. We can         our lifestyle. A lot of Americans go to work         bike now. Riding bikes is clean and healthy. It helps people get strong. Let’s try together! I hope we can live in a green world with no pollution        .

A．can’t B．needn’t C．won’t D．aren’t

A．interesting B．important C．difficult D．dangerous

A．how B．what C．why D．where

A．lessons B．fun C．skills D．problems

A．small B．clean C．busy D．modern

A．green B．red C．yellow D．white

A．takes B．spends C．pays D．costs

A．have B．change C．enjoy D．make

A．on B．by C．with D．ride

A．something B．some days C．some day D．any day