The bed piano allows a music lover to play ____ piano while he is lying in bed．（ ）
A．aB．anC．/D．the
﹣﹣Do you know zongzi in traditional in China，Li Ping？
﹣﹣Usually during the Dragon Boat Festival．（ ）
A．why people makeB．when people eat
C．where people buy
If all business goes paperless，at least one million tons of paper a year．（ ）
A．are savingB．will be saved
C．were saved
﹣I'm feeling much better．Must I go on taking the medicine，doctor？
﹣No，you________．You'll get well soon．（ ）
A．can'tB．mustn'tC．needn't
﹣Which way do you prefer，reading online or reading on paper？
﹣______．Sometimes I read online，sometimes I read on paper．（ ）
A．EitherB．BothC．Neither
﹣It's raining hard，you should drive as _______as possible．
﹣OK，I will．（ ）
A．clearlyB．quietlyC．carefully