Here are the best words to fill in the blanks:

1. **competitive**
2. **suffer**
3. **with**
4. **down**
5. **avoid**

So the completed passage would read:

"Teenagers today live in a very **competitive** world. It is more important than ever to succeed at school if you hope to have a chance in the job market afterwards. The result is that young people **suffer** from stress. There are different ways of dealing **with** stress. First, physical exercise is a good release for stress because it increases certain chemicals in the brain which calm you **down**. You have to get enough sleep to **avoid** stress and to stay healthy and full of energy. Another way to..."