Here are the suggested words to fill in the blanks:

1. **have**
2. **suffer**
3. **tasks**
4. **stress**
5. **caffeine**
6. **addictive**
7. **because**

So the complete 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. It’s no wonder that many young people worry (2) **suffer** letting down their parents, their peers and themselves. To try to please everyone, they take on too many (3) **tasks** until it becomes harder and harder to balance homework, assignments, parties, sports activities and friends. The result is that young people (4) **stress** from stress.

There are different ways of dealing with (5) **caffeine**. Everyone knows that caffeine, in the form of coffee or soft drinks, keeps you awake and alert. But caffeine is a drug which can become (6) **addictive**. In the end, like other drugs, caffeine only leads to more stress. There are (7) **because** ways to deal with stress: physical exercise is a good release for stress, 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."