As is known to all, we live in a world of germs（細菌）. It is impossible to avoid exposure. Genetic makeups may give some people 1. advantage over others. However, it does not stop people from becoming sick.

All of us have been a victim of an 2.(ill) at some point in our lives. Moreover, it is likely that we 3.(get) sick again in the future. Our best chances of avoiding sickness 4.(be) by exercising and employing good 5.(habit).

While good hygiene and exercise serve as obvious advice to most people, eating 6.(healthy) is not always obvious. If you cannot define “healthy”, then your immune system will be happy 7.(tell) you. The immune system is the foundation of our health. It works for us every day to keep us well. Ask 8.(you): “Are you making its job easier 9. harder?”

Like any system, the immune system is not different. It has a tolerance too. If you eat unhealthily, your immune system will make you aware of it.

Take a step in the right direction 10. including some healthy food in your diet.

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