I still keep taking exercise every day _____ I am busy with so many subjects．（ ）
A．untilB．unlessC．becauseD．though
The path was covered with snow，so we walked very _______．We were afraid of falling．（ ）
A．quicklyB．carefullyC．excitedlyD．hurriedly
China's high﹣speed railways _____ from 9，000 to 29，000 kilometres in the past few years．（ ）
A．are growingB．were growing
C．will growD．have grown
___________ can you write in English？
About forty words per minute．（ ）
A．How farB．How oftenC．How fastD．How long
It's important for us ___________ good manners．（ ）
A．havingB．haveC．to haveD．had
Which do you like __________ ，juice or cola？（ ）
A．wellB．betterC．bestD．the best