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）.
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. can’t be overemphasized / can’t 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 。