9．When you laugh，you will （86）open your mouth and show your teeth．The healthier those teeth are，the happier you look．Why is that？ It's because your teeth are important in many （87）ways．If you take care of them，they'll help to take care of you．Strong healthy （88）teeth help you eat the right food to help you grow．They also help you speak clearly． Brush your teeth （89）twice a day-after breakfast and before bedtime． You also need to care about （90）what you eat and drink．Eat lots of fruits and vegetables and drink water instead drinks．
名师金手指领衔课时系列答案
