Mary __________ every day after school, but now she __________ all the time.
The main unit _________ all the computer’s electronics.
You _______ ever saw computers years ago, but now they are everywhere.
— ! I left my wallet in the desk and now it’s still here.—Lucky you! You should take good care of your things.
—Look! Lily and Sally are cleaning the school laboratory.—Let’s go and join them. .
—Excuse me, could you tell me ?—It’s just 5 minutes’ walk.