请用英语写出几条用手机上网的好处与坏处：
Advantages:（优点）
I can link to the Internet for free as long as wifi is available.(有wifi就能免费上网)
It's especially convient when I need to find my way using electric map.（我可以用电子地图定位找路）
Disadvantages(不足)：
It may distract my attention during the class.(它可能使我上课分散注意力)
The batteries of my cellphone run out fast.(手机用电用得快)
上面两道题对你来说应该没问题.