7. Firstly (Number one, First,...), sitting in front of the computer all can cause many health problems such as: eye strain obesity. (vấn đề/ nguyên nhân, dẫn đến, các vấn đề về sức khỏe, mỏi mắt/ đau mắt)
8. Second, we can get angry (so / very easy)
9. Third, if we using the computer to much, we can't have much time for we family and your friends. (tốn/tiêu hao/chi tiêu, dành thời gin với "ai đó"...)
