I have more storybooks than _________ do.—- But your books are not as interesting as _________.

________ nearly all behavior is learned behavior is a basic assumption ________ has been put forward by social scientists

Have you _____ had dumplings—No, not _____.

Thank you for ______ me the e-mail.

Let’s go out for a walk.—You’d better not. These days the air is getting much ________ than it was before.