Now the air in our hometown is even than it was before. —So we must do something to stop it.

What time will Mr. Brown be back to China? – Sorry, I don’t know______.

Would you like more tea? —No, , thanks．

This is the computer ______ Mum gave me for my birthday．

Who is the student on the playground?? —- Andy. _____ often takes a walk with ______.