Read the text about vitamins and answer the questions

Read the text about vitamins and answer the questions. Humans can't live without vitamins. However, our body can only produce vitamins D and K. When we are exposed to sunlight, our body makes vitamin D, while vitamin K is produced by bacteria in our intestines. There are 11 other vitamins: A, 8 B vitamins, C and E. The B-complex vitamins and vitamin C are water-soluble vitamins that are not stored in the body. Our body only keeps a small amount of them and throws away the amount it does not need. Vitamins A, D, E, and K do not dissolve in water. Our body stores the unused amount of this vitamin in its fat and liver. Therefore, it is not good to have too many of them. Humans get most of the vitamins from foods or vitamin pills. We should have a healthy diet with different kinds of foods to have enough vitamins for our body.
1. How many vitamins are there?
2. Which vitamins does our body produce?
3. How many vitamins can dissolve in water?
4. Why is it not good to have too much of vitamins A, D, E and K?
5. Where can we get most of the vitamins?