---Now the air in our hometown is even than it was before. ---So we must do something to stop it.
While Jim ______the floor, someone ______at the door.
This pair of jeans ________ them 300 dollars.
Not only he but also his parents _____China for two years .
--Never forget to bring your homework with _______. --__________.
I think your advice is of great ________ to me and it’s _______.