Lisa’s cat _________ her hat.
— Do you believe that paper is made _______ wood?—Yes, I do. And you can see that books are made________ paper.
— Do you know ________ this afternoon?— I'm not sure, but I'll tell you as soon as she ________.
If there is ______ pollution, the air in our city will be ________ dirtier.
By the time I locked the door, I realized I ________my keys at home.
—________ English movies is helpful to learn English.—But I find _______ hard to understand when the people speak fast.