问题补充：
Bad breath (口臭) is a big problem. You can make people around you feel bad when you’ re talking to them.
Why do some people have bad breath? If you don’t brush your teeth, germs (细菌) will live in your mouth and between your teeth and you will have bad breath. You may also have bad breath because of foods like onions.
How can we stop bad breath? Some people say that gargling ( 漱口) can make bad breath go away, but it isn’t true. Gargling only stops bad breath for a short time. Some people also say that brushing your teeth can stop bad breath. Most people only brush their teeth for 30 to 45 seconds and it doesn’t work. To clean all of your teeth, you should brush for about 3 minutes each time.
If you don’t want to have bad breath, please look after your teeth and mouth well.
Reasons to have bad breath
People don’t 【小题1】their teeth and leave germs in their 【小题2】and between their teeth.
People eat foods like 【小题3】.
【小题4】to stop bad breath
Gargling can only stop bad breath for a short time.
We should brush our teeth for about 【小题5】.
brush
答案：
(答案→)brush
解析：这篇短文主要讲述了造成口臭问题的原因，及其解决办法。
【小题1】根据If you don’t brush your teeth, germs (细菌) will live in your mouth and between your teeth and you will have bad breath.描述，可知答：brush，刷牙。
【小题2】根据If you don’t brush your teeth, germs (细菌) will live in your mouth and between your teeth and you will have bad breath.可知答：mouth，口。
【小题3】根据第二段You may also have bad breath because of foods like onions.描述，可知填：onions洋葱。
【小题4】根据右栏内容，可知此处指的是如何解决口臭问题。故填：Ways/How，方法/如何。
【小题5】根据To clean all of your teeth, you should brush for about 3 minutes each time.描述，可知填：3 minutes三分钟。
