---Who is the tallest boy? ---It ______ be John. John is of medium height.
In the street I met the professor______ gave us a talk last week.
Paul doesn’t have to be made _______ . He always works hard.
—Would your brother go for a picnic this Sunday?—If I don’t go, _______________.
I must return the book to the library. I _____ it for one week.
You should eat lots of _______, because it’s good for your health.