题目内容：

第二节: 语法填空

Vitamins are a group of substances（物质）found in food. The body needs them for life and health. So usually, many people care for the question: am I getting enough vitamins, and am I getting the right kind?

Even though very small amounts of each vitamin are enough for the needs of the body, the worry people have about vitamins has some reasons. And this has to do with their ___11_      --- the food they take in. A person eating a good variety of food get all the vitamins now ___12   ___ (know) to be needed.

The problem is that there are many people who don’t ___13_   __ foods wisely. So the answer ___14   ___ this question is: No extra ___15_  __ are needed, ___16    __ you eat proper foods. In fact, many of the vitamins cannot be ___17_  __（store） in the body, so when extra vitamins are taken in, the body simply gets rid of them. It is even ___18   ___ (harm) to put too much of certain vitamins into the body. This has been found to be ___19        (truth) of vitamin A and D, when ___20    ___ amounts are taken in.