how　

　　7．(2015·四川卷)The exhibition tells us ________ we should do something to stop air pollution. 解析：句意：这个展览告诉我们(为什么)我们应该做一些事情来阻止空气污染。“ ________ we should do something to stop air pollution”为宾语从句，该从句中缺少原因状语，故答案为why。或者理解为由that引导的宾语从句。 8．Exactly ________ the potato was introduced into Europe is uncertain, but it was probably around 1565. 解析：句意：土豆被引入欧洲的确切时间不能确定，但很可能是1565年左右。分析句子结构可知，设空处为主语从句的引导词，从around 1565判断，这里指时间，故填when。

　　when　

　　why/that　

　　Ⅱ.语法填空 If you think you know a lot about technology because you know that “LOL” means “laugh out loud”， you may be much less cool than you thought. Today, acronyms(首字母缩写词) and shortened expressions are __________ (wide) popular across the Internet, especially on social media and texting apps, as they offer shorter ways of communicating. For teenagers, _____________ (speak) in their own language also helps them to communicate ________ their own way. To help parents understand the Internet slang(俗语) ______(use) by teenagers, the UK government _______________ (launch) a new guide on its official dictionary website Parent Info on Sept 7. speaking

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