The charity sale our school organizes every year hastaught us much that we would never have _____ learned in class.

Who would you rather _____ your graduation ceremony tomorrow, your parents or friends?––All of them

What are you reading, Dad— I’m not really reading, just ______ the pages.

It’s said that ______ of the water around the world______ polluted.

Please _______ that stamp, for it is quite rare nowadays.