| roads, walk, faster, Children, important, traffic |
If you are in big cities like Shanghai or Beijing, maybe you get to school by subway; or you have to
Ten years ago, bicycles were very popular in most villages. Every family had one or two of them.
Buses are also very
On TV we can see elephants, m1．, dogs, bears or other animals doing a lot of things for us. For example, elephants can carry things, dogs can look a2． houses and lead blind people to cross streets. If we watch more c3．, we can find those animals always get a little food to eat after they have done something. So scientists say many d4． animals may learn to do more easy w5． for us if they know they will get something to eat.
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