It’s _________ for us to finish such a difficult program. We have to say sorry to them.
—What are you going to be when you grow up?—A(n) ____. I like to draw pictures very much.
—What should I do to ____ healthy?—Try to eat a balanced diet.
—____ does Jane exercise?—Four times a week.
My sister still wanted to go to school ____ she was ill.
In this country, ___________ children shouldn’t smoke.A. five-years-old B. five-year-old C. five-year-olds