Researches show that during your teenage years，the body's biological clock is __4__，telling you to sleep later at night and wake up __5__ in the morning.But __6__ in the body clock aren't the only reason teens lose sleep.Lots of people have insomnia（失眠）．The most common cause of insomnia is __7__.But all sorts of things can lead to insomnia，including __8__ discomfort，emotional troubles and even sleeping environment.It's common for everyone to have insomnia occasionally.But if it __9__ for a month or more，go and consult a doctor.

　　Most teens have __10__ sometimes，which may make you sweat.But，if they are too frequent，a person's sleep pattern can be seriously __11__.The most common cause of them is emotional __12__，such as fear，stress or anxiety.If you have them a lot，you're also supposed to talk to a __13__.

　　Medical specialists encourage teens to make lifestyle changes to help them develop good sleeping __14__.Most probably you know that a cup of coffee can keep you __15__ at night，but did you know that playing video games or watching TV does the same?

　　1．A．yells

　　B．proves

　　C．claims

　　D．complains

　　答案：D

　　解析：根据语境可知，此处是指他抱怨昨晚没睡好。complain意为“抱怨，发牢骚”，符合语境。故选D项。

　　2．A．adults

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