子曰：“学而时习之，不亦说乎？有朋自远方来，不亦乐乎？人不知而不愠，不亦君子乎？

曾子曰：“吾日三省吾身：为人谋而不忠乎？与朋友交而不信乎？传不习乎？”

子曰：“学而不思则罔，思而不学则殆。”

子曰：“知之者不如好之者，好之者不如乐之者。”

子曰：“饭疏食饮水，曲肱而枕之，乐亦在其中矣。不义而富且贵，于我如浮云。”

子曰：“三人行，必有我师焉。择其善者而从之，其不善者而改之。”

子在川上曰：“逝者如斯夫，不舍昼夜。”

子曰：“三军可夺帅也，匹夫不可夺志也。”

子夏曰：“博学而笃志，切问而近思，仁在其中矣。”

（儒家《论语》）

细菌在自然界中数量多少是环境污染程度的重要指标之一．某校生物兴趣小组为了调查当地一条河流中细菌的污染情况而进行了实验．请回答与此实验相关的问题：

    How are you getting along with your high school? It may be hard for you as this is the first time you ____ (leave) your parents. I know that you are now having trouble ____ (communicate) with others. That's ____ you are new here and people don't know about you. But I think you can follow the advice below.

    First, you should take ____ active part in the discussions and show your own opinions about the matters, and at the same time, learn to listen to other people's views ____ (careful). Second, you should learn about your classmates' likes and dislikes, ____ can make you get familiar with them. Only in this way can you get to know more ____ (difference) people and show them that you are just as friendly. I'm always here ready to help. We can take part in some ____ (activity) together and I can introduce you to others.

    There's no need ____ (worry) too much. People will know you more very soon and will like to make friends ____ you if you can do as the above. Just remember, “God helps those who help themselves.”