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