Mom： Morning， early bird．

Son： （71 ）　　， Mom．

Mom：（ 72）　　？

Son： I'm online talking to my friends．

Mom： （73）　　？

Son： Of course， I know them． They're all my schoolmates．

Mom： That's OK． But be careful to make friends online． Never tell strangers our address， phone number and other private things like that．

Son： （74）　　？

Mom： If not， you'll probably get into trouble．

Son： （75）　　． I'll be careful， I promise．