Nearly 90 percent of the young people in our country use the Internet, but about half of them use them every day. They visit chat rooms and sending e-mails. More and more scientists has begun to wonder: Is the Internet good or bad for kid? Some of them think what it is impossible to answer that question because the Internet has so much things. What’s more, recently studies show the online world can be helpful at some ways and dangerous as well. It can be both an educational resource and hiding place for bad people.but---and
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(答案→)but---and
解析：
【小题1】but---and考查并列连词的用法。根据句意这里是顺接关系，故用and；
【小题2】them---it考查代词的用法。此处it指the Internet故用单数it；
【小题3】sending—send考查并列关系。此处and其后是并列关系，所以用原形；
【小题4】has---have考查谓语动词的单复数。根据主语More and more scientists可知，谓语动词用复数形式。故用have；
【小题5】kid---kids考查名词的单复数。根据句意这里指孩子们，故用kids；
【小题6】what改为that或去掉 考查宾语从句的连接词。Think后是宾语从句，宾语从句句子完整，语意完整，所以用that或去掉what；
【小题7】much----many 修饰名词复数用many；
【小题8】recently---recent修饰名词studies用形容词recent；
【小题9】at—in 考查介词的用法。在某种程度上用in some ways；
【小题10】and后加a 考查冠词的用法。此处place是一个可数名词，故用不定冠词a