17.I’m ____a diet, since I put ____ weight easily.
________ you’ve heard the song, you’ll never forget it.
The mother asked the boy ________ football in the street. It was dangerous.
—I’m going to the States.—How long ________ you ________ there?
Can we ________ the internet when we study?
The country has ________ too many wars in the past ten years.