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       At some time in your life，you might have a roommate．It is a good idea to share a flat，especially for students or people who have just finished school，because flats are usually expensive．And m____ is not the only reason for having a roommate．Sharing a flat can be fun．

     But life with a roommate can also be a t____ experience．Some experts did a study of college students who shared a room．They found that students who had problems with their roommates were not happy at school and were more likely to get sick than other students．So，how can you l____  with a roommate and enjoy it? Here is some advice:

      Being roommates with a friend can be hard. Friends may be different when you stay with them all the time from when you don't see them very o ____．So， before you plan to share a room with a friend，discuss the situation carefully．

      If you decide to share a room with someone you don't know，talk to each other．It's important to be h ____ about your habits and things you hate．

    When you move in with a roommate，make rules．Decide how you will share h ____，such as cleaning，washing and shopping． Will you share food? Is it OK to have guests? And what about loud music?

     Don't get angry at small things that your roommate does．Try to f____  the unhappy things between you and your roommate．No one —including you — is perfect．

黑暗时，甲处测到的CO₂主要来自____ ____ 等。

下列关于家庭电路和安全用电说法，其中正确的是