`(1)` doubt

`->` no doubt : không còn nghi ngờ gì nữa

`(2)` much

`->` time không đếm được nên phải dùng "much"

`(3)` spare

`->` spare time : thời gian rảnh

`(4)` harmful

`->` harmful (adj) : có hại

`(5)` at

`->` staring at :nhìn chằm chằm

There is no doubt at all that the Internet has made a huge difference to our lives. However, most parents worry that their children spend too much time browsing the Internet or playing computer games, hardly ever doing anything else in their spare time. Naturally, parents are curious To find out why the Internet is so attractive, and they want to know if it can be harmful for their children. Should parents worry if their children are spending that much time starting at their computers.