语法填空（共10小题；每小题1分，满分10分）
阅读下面短文，在空白处填入适当的单词或括号内单词的正确形式（每空一词）。
The bicycle is one of the most important vehicles in the world.In every country most people are （1）_____________（use）to riding bicycles for work，for sport or just for fun.Bicycle riding is good exercise.It helps people be（2）_____________（health）.Bicycle riding can make the（3）______________（riders）hearts and lungs strong.It is also good for the environment（4）_____________bicycles don’t cause pollution.
Bicycles always（5）________________（share）the road with cars and trucks.Drivers sometimes do not notice bicycles.So bicycle riders must pay attention（6）_____________the traffic around them and know traffic signs.They must know and follow the safety rules.Besides，people must wear helmets to（7）_____________（protect）their heads.
（8）_____________people ride at night，they must wear light-colored clothes，and have lights in the front and reflectors on the back of（9）_____________（they）bicycles.A bicycle may be serious and people must know how to give first aid.If an accident happens and the person hurts（10）_____________（bad），they must call 120 for help.In a word，the best way to be safe is to be careful.(www.xing528.com)
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