People ride bicycles all over the world.In China you may（1）

notice

notice

/?n?ut?s/ that many people don't wear helmets when riding bikes.But in many other countries，people have to wear （2）

them

them

（they） when they ride their bikes.In some places of the USA，riding bikes （3）

without

without

helmets is against the law （法律）.Other countries，such as Australia and Spain，have laws saying that everyone must wear a helmet for their own（4）

safety

safety

（safe）.Many people say that helmets are like seatbelts （安全帶）. （5）

Wearing

Wearing

（wear）them can protect people's heads from injury.
   In China，bicycles have their own special roads but （6）

riders

riders

（rider） must obey the traffic rules.If they're （7）

careless

careless

/?ke?l?s/ and break the rules，they may be in danger.In the USA，roads are only for cars.People don't ride their bikes to school or work often， （8）

but

but

this isn't true for other countries in the west.The Netherlands（荷蘭） has a lot of bikes because riding them doesn't cause（9）

pollution

pollution

/p??lu???n/.The whole country has good bicycle roads.
   Do you ride your bike to school？In China，this is very common.But in the USA，kids only ride their bikes（10）

for

for

fun on the weekend.They see bicycling as a sport.