He is __________ unusual inventor and he invented _________ useful invention.A. a; an B. a; a C. an; an D, an; a
– When will you be free, Mr Smith? I want to visit you. – Er, on Saturday or Sunday. ________ day is OK. A. All B. Either C. Both
Look! The kites in the sky are in different ________. Some are big and others are small. A. sizes B. colors C. pictures
--- Do you know __________ this evening? --- Let me see. Oh, in two hours.
McDonald’s restaurants _________ in Crimea(克里米亚) by the company on Apr 4th, 2014.
--- Your shoes are so old. Why don’t you buy a new pair? --- Because I _______ all my money on an iPod.