Jack, ________ put the pens and pencils here and there, please.
—Is Mrs.Smith in?—I’m afraid she isn’t.Would you like to ________ a message?
His hobby is ________ watching TV ________ playing the piano.It’s reading books.
Look,Tina is waiting ________ the bus stop.
Each of us has to write a ________ report every two weeks.
Now the air in our city is ________ than it used to be.Something must be done to stop it.