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.