If you _______ spit at all. please spit in the bucket provided. 

-----Do you know where David is ?  I couldn’t find him anywhere.-----Well. He _______have gone far-----his coat’s still here.

—________ I take the book out?—I'm afraid not.

—Could I borrow your dictionary?—Yes，of course you ________.

If you know nothing about the famous program called Where are we going, dad?, you ______be living in a box!