1, >> Why does Lan worried
> Because, she goes to the dentist.
2, >> Why does Hoa s mother get up early
> Because, she has to prepare for family' s meal
3,>> Why should you brush your teeth regularly
> Because, we want to have healthy teeth
4, >> Why did Mai not go to meeting yesterday
> Because, she was sick
5, >> Why shouldn' t we eat too much candy
> Because, it is bad for our healthy