Đọc hiểu và hoàn thành văn bản quảng cáo và thông báo

There have been lots of surveys about teenagers and happiness and they all come to differrent conclusions. Some surveys say that most young people are happiest (1) ________ Others say it is with their friends. There is not just one thing that makes everyone happy. Happiness is something different for each of us, and (2) ________last week might not make us happy next week!

However, there are some things that can help improve our mood. Experts believe that exercise can make you a happier person. Exercise releases chemicals in your brain that are related to a feeling of pleasure. Many people who exercise say that the more exercise they do, (3)________. Exercise is also good for our physical health. If we know that we're doing something healthy, that should make us even happier!

There's another surprising idea to help make us happier. Although you might think that eating chocolate is bad for you, (4)________ Of course it is not healthy to eat too much, but chocolate releases chemicals in the same way that exercise does, and for some people it's easier and quicker than working out at the gym!

(5) ________you can't be happy all the time. There are times in your lives when things are going well and we feel good. We can be happy for brief moments and we should value these. Maybe your dog does something silly that makes you laugh. Just a brief moment, but remember it! And when you feel sad, go for a run or (6)________ - you'll soon cheer up!

A. which causes it to erupt B. when to cause it to erupt C. what causes them to erupt D. what causes to erupt them