阅读下面短文，根据短文大意和语境选择方框内的单词，并用其正确的形式填入空白处，使补全后的短文意思通顺，语法正确，结构完整。
send expensive waste problem cool
Dear headmaster,
I’m a student of Grade 9. I want to tell you something. In our school, many students have mobile phones. They think it’s 1 to have a mobile phone. Yes, the phones let students talk with their parents and friends at any time. But I don’t think it’s good for students to use them at school. Many students spend lots of time in 2 messages by mobile phone, some students even use them to play games in class or cheat (作弊) in the exams. Some students
always hope to buy the new or 3 mobile phones and this will 4 their
parents’ money. And my father tells me that most mobile phones can cause (引起)
many health 5 . Could you do something to stop it?
Yours,
Sophiacool
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(答案→)cool
解析：根据短文大意和语境选择方框内的单词，并用其正确的形式填入空白处，使补全后的短文意思通顺，语法正确，结构完整。注意单词的适当形式。