My answer:
1. You have toothache because you eat much candy.
2. I can have more time on Sunday, so we can go to the zoo.
3. You should eat less fast food.
4. Today I am going to school but my brother isn't going. (??)
5. Sports, such as riding a bike and running need a lot of calories.
6. My mom wants she to be more healthier so eats more fruits and vegetables.
7. You should come back home early because it's cold.
8. I don't want to go to bed so i should be tired tomorrow early.
9. Mai try to talk less because she has a sore throat.
10. It's harmful to your body if you go to bed late.