As we know, everyone has problems. And      we don’t deal with our problems, we can easily become unhappy. So how do we deal with our problems? Here are some ways.

By learning to forget

Most of us have probably been        with our friends, parents or teachers. Perhaps they said something you didn't like, or you felt unfair. Sometimes, people can stay angry for years about a small problem. Time goes by, and good friendships may       .

Perhaps we have seen young children playing together. Sometimes they have disagreements, and decide         to each other. However, this usually does not.            for long. This is an important.         for us: we can solve a problem       learning to forget.

By regarding problems as challenges

Many students often complain about       . They might feel they have      work to do sometimes, or think the school rules are too      We must learn how to change these "problems" into "challenges". Education is an important part of our development.      young adults, it is our duty to try our best to deal with each challenge in our education       the help of our teachers.

By thinking of something worse

By comparing.         to other people, you will find your problems are not so terrible. Think about Stephen Hawking, for example, a very clever scientist,     regards his many physical problems as unimportant. He can't walk      even speak, but he has become very famous and successful. Don’t worry about problems. Let's face the challenges instead.

柴油在柴油机中的燃烧过程是一个很复杂的（）变化。