--- Have you _________ chatted with your friends on the Internet?--- No, ________.

— Steve is good at writing short stories. — Yes, he is. But he writes          than us, so he doesn’t get good marks in writing.

He has        work to do, so he can’t go with you.

 —What’s the matter? You looked unhappy.—Well, the teacher spoke so quickly and I can __________ understand it.

 Helen was so excited at the news that she could         say a word.