Bob, can you play violin— Yes, but I don’t have violin.

The headmaster was dismissed three months ago.The post is too important to leave __________ any longer,especially before the college entrance examination.

Obama , the first black president in American history , _______ presidency on January 20th ,2009.

e me, what can I do for you—Yes. I’d like to place ____ advertisementfor _____ used car in your paper.

Would you like to eat some hamburgers–,but I’m full.