A skill that is very common and is a skill that must be taught first because the speaker will have to listen to understand before you can say online. Read or write.
Is a skill that is very widely used and is the first skill that must be taught because they say they want to hear, to understand before you can say interactive? To read or write.
It is the skills and use it. It is the first skill to be taught because the speaker will have to listen to understand first before you can read or write dialog said.