1.Everyone has his inherent ability ,________________ （只是很容易被习惯所掩盖）. 2.The importance of traffic safety , _________________ （无论如何强调都不为过）. 3.In my opinion , ______________ （打电动玩具既浪费时间也有害健康）. 4.There is no doubt that ______________ （近视是一个很严重的问题）among the youth of our country. 5.According to my personal experience , ___________________ （微笑已带给我许多好处）. 答案与解析： 1. which is easily concealed by habits 每个人都有与生俱来的能力，只是很容易被习惯所掩盖。本题的难点在于对动词掩盖的选择。这里的掩盖是抽象含义，并不是像cover那样能找到真实的掩盖物，所以应该选择conceal，常用搭配由：conceal...from。另外，这句话是一个非限制性定语从句。句子需填补内容是对 ability的补充说明，能力是中心词。因此，要用which引导这个非限制性定语从句。 2. cant be overemphasized / cant be emphasized too much 本句考查的是再......也不为过的的说法。英语句型是：cannot + do sth. + too much 或 cannot over-do，如：He is so excellent that we cannot praise him too much.（他是这样的优秀，我们怎样称赞他都不过分。）cannot是否定，与too much 和 over-V. 结构连用时强调肯定，表示怎么......也不为过。 3. playing video games not only takes much time but also does harm to health句子需填补部分的主语是打电动玩具，虽然打是动词，但根据全句结构我们需要将play处理成动名词形式充当主语。此外，考察不仅......还的句型。浪费时间除了答案表达之外也可以用waste time 。 4. near-sightedness is a serious problem There is no doubt that后接从句，从句里应有完整的主谓宾结构。如：There is no doubt that the thief jumped into the room from the balcony in the second floor.（毫无疑问，小偷是从二楼的阳台跳进来的。） 近视还可以说成myopia 或 short sight 。 5. smile has done me a lot of good 本题考察带给某人很多好处的表达。我们知道对某人有好处可以说成do good to sb. 或do sb. good，依此类推，给我带来很多好处就是：do a lot of good to me或do me a lot of good 。