Nowadays, it is very          for us to live a low-carbon life. The first thing we can do is          bikes instead of driving cars. First, bikes are        than cars and everyone can afford it .Second, it’s easier          parking places for bikes. Third, the petrol is not necessary for bikes, so bikes won’t produce dirty air to make pollution to our environment. Finally, we can ride bikes to keep          Let’s ride bikes instead of driving cars to protect the environment!

A．importance B．easy C．difficult D．important

A．ride B．rides C．riding D．rideing

A．much cheap B．much cheaper C．much dearer D．smaller

A．to find B．find C．look for D．find out

A．fast B．slowly C．easy D．fit.