语法填空。（每小题1分，共10分）
Running has become popular in China, especially in cities. It's become a habit with my friends to share their experiences and photographs of _ (run) on social networking sites. This year's Shanghai Marathon and Beijing Marathon were spectacular with _____ (thousand) of people registering to take part in them.
There are many reasons why an increasing number of people, ____ (include) some celebrities, are taking to running. Some people run to build their bodies ______ others run to challenge_____ (they) to do something they haven't done before. But the majority of the people run to keep ____ (health) and avoid diseases such as high blood pressure, obesity and heart attacks.
I started running because of what my PE teacher in primary school said: If you want to be smart, run; if you want to be strong, run; if you want to be healthy, run.
I love running not because I am a good runner, but because I want to become a ____ (good) runner. I go for a run on the playground of my campus whenever I get some spare time. Once I came second in the 1,500-meter race at my school sports meet. Last year, I took part in the 2013 Zhengkai International Marathon, which was a really rewarding experience because I met a senior citizen who also participated in the event. His spirit touched me and _ (inspire) me to overcome fear and setbacks.
Life is like running: it is essentially your own business. During this process, you have neither partners __ competitors. It's yourself that you are going to surpass. _, just run. It will help you de-stress and unburden your worries. Running reinvigorates us, and makes us more optimistic, diligent and energetic. Hope you enjoy your run.