16. ---John, I hear that Fast &Furious 7 (速度与激情)is _____ exciting movie. Why not go to the cinema tonight?
--- Sure. Let’s have _____ quick dinner so that we can get there on time.
A. an; a B. /; a C. an; / D. a; /
17. Can you hear the birds __________ in the forest?
A. sing B. singing C. sung D. to sing
