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
　　2. can't be overemphasized / can't be emphasized too much
　　3. playing video games not only takes much time but also does harm to health
　　4. near-sightedness is a serious problem
　　5. smile has done me a lot of good