单项选择题
W: I’d like to send this package air mail special delivery and insure it for 5 dollars, please. M: Sure. thing. That’ll be $ 2.50 for the postage and 50 cents for the insurance.
A.$5.00. B.$2.00. C.$2.50. D.$3.00.
A.finished B.finish C.have finished D.had finished
A.understanding B.to be understood C.understood D.to understand