(1) Most problem in this world arise when I am too emotional. → you [people] are
(2) Anyone has their own dream. → Everyone
(4) Anyone who want to apply for the scholarship have to fill out this form. → Those [People]
(5) Some of people are fond of coriader, while others hate it. → Some people [Some]
（解答）You (will) get a stomachache when [if] you eat too much.
（別解）Eatting too much will give you a stomachache.
（解答）If I have time, I would like to visit [to go to / to travel to] Sapporo (during) this summer vacation.
（別解）If time allows [permits], I would like to take a trip to Sapporo this summer vacation.
（解答）Young people do not care much about what other people think of them.
（別解）There is tendency for young people not to worry much about how they look to others.
（解答）People [Those] who like listening [like to listen] to music are not always good at playing it.
（別解）Not all people who like listening to music are good at playing a musical instrument.
（解答）Some people are always (very) punctual [punctual to the minute], while [whereas] others are almost always late (for appointments).
（別解）There are (some) people who are always punctual, while others are never on time.
（解答）It is ocvious that if you start writing without deciding what to write beforehand [in advance], unless you are very used to writing, you will not be able to develop or organize your tinking.
（別解）If you start to write without any clear idea in mind, unless you are excellent [very good] at writing, it will surely be impossible (for you) to understand clearly what you really want to say or put your thought together.
（解答）In this country, when people meet each other, they usually bow instead of shaking hands.
（別解）People in this country usually bow instead of shaking hands when they meet someone.
（解答）I would like to [want to] get used to this custom soon.
（解答）It is difficult [hard] to do your best if [when] you feel (too) nervous, lack confidence or cannot concentrate ( on what you are doing).
（別解）If you get nervous, lose courage, or cannot concentrate, you cannot prove yourself.
（解答）It is not always bad to make mistakes, because you can learn (a lot / a lot of things / many things) from (your) experience. The important thing is to try not to make the same mistake again.
（別解）You should not always get disppointed when you make a mistake, because you can learn from a failure. It is important to make an effort to avoid the same mistake.
（解答）In modern life, everyone (often) has a lot of stress. You should relieve stress by doing things such as getting miderate [some / proper / enough] exercise, listening to music, or spending time in the country.
（別解）Modern life can be stressful. Getting moderate exercise, listening to music and spending some time in a natural setting are good ways to relieve stress.