阅读表达，阅读短文，并按照题目要求用英语回答问题。
[1]Everyone has periods in his life when everything seems very hard, when there’s nobody to talk to and the mood is just getting worse and worse. There are some things that may help you lift up your mood.
[2]The first thing you should try is socializing and thinking positively. It is very hard, because usually when we feel depressed we lock ourselves at home and try to think about all the bad character issues we have. But if you try to force yourself and call a friend for a cup of coffee, the chances of changing your mood into a better one are very good. _____ Instead, try to think only about the bright side of your life. Don’t forget: We are what we think we are.
[3]You should also try doing something only for yourself, something totally selfish. This could be something you wanted for a long time: maybe a short trip, a coat, a ring or anything that could lift up your mood. This doesn’t have to be extravagant（奢侈的）or costly. The point of all these is being good to yourself.
[4]Giving presents to yourself can lift up your mood. What’s more, buying things to others may be a perfect way to feel happy. Think of your friends, families, relatives or even local charities, choose one person and give him a gift that doesn’t have to be something expensive or big. It may be just a little toy to your poor neighbor’s child. Making another person feel happy will make you feel good in your heart and mind.
[5]Meeting a positive person should be very useful. Just try to keep your problems off the conversation. The idea here is to get out of your shell and have some interaction. Get involved with someone else and your mind will take a turn as well.
What’s the main idea of this passage? （no more than 8 words）
Why does the author suggest buying things to others? （no more than 10 words）
Fill in the blank in Paragraph 2 with proper words. （no more than 6 words）
List three ways that can lift up your mood, according to the text. （no more than 16 words）
①
②
③
What does the word “It” （Line 4, Paragraph 4） probably refer to? （no more than 3 words）