（ ）19．I’m a little hungry. Pass _________ a piece of bread, please.
A. I B. me C. my D. mine
（ ）20．The movie will start _________7:00 o’clock. Let’s hurry.
A. on B. in C. at D. for
（ ）21．－__________ shall we have our class meeting?
－Next Monday.
A. Why B. Where C. When D. What