It looks like you're asking for help with a text that discusses stress among teenagers and offers ways to deal with it. Here are some possible words to fill in the blanks for the phrases you provided:

1. (2) **suffer**
2. (3) **with** (this one is already provided)
3. (4) **down**

The complete version could be:

"Teenagers today live in a very **well** 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 **suffer** stress and to stay healthy and full of energy. Another way to..."

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