—Excuse me, Mr. Brown. ______ you speak Chinese?—Yes, butt only a little.

You _______be hungry already—you had lunch only two hours ago.

So many people violate traffic regulations that we ____ put too much emphasis on the importance of traffic safety. 

--- Can you ride a horse?　 --- No, I ______.

Even a drop of water ______because it is so important to all the living things.