--- Are you worried when your son often plays computer games? --- Yes. I think playing too many computer games ______ on teenagers.
He does not know ______ they will plant trees on Saturday or not.
Tom usually ________early.
Can you tell me_____ you are from?
---Would you mind if I open the window? ---______________, I’ve got a cold.
---You shouldn’t stay up late tonight. --- Thanks, I will go to bed earlier. ___________.