Sorry， you can't take the dictionary away，Vicky．I it．（ ）
A．usedB．am usingC．have usedD．was using
Every time Tom is late， he'll ___________ an excuse． So I wonder what his excuse is this time．（ ）
A．set upB．put upC．take upD．make up
The ____________that there is life on other planets has always encouraged scientists to explore the outer space．（ ）
A．invitationB．possibility
C．orderD．advice
I didn't see you at Jim's party last week．
I had to work that evening， so I _________ go．（ ）
A．needn'tB．mustn'tC．couldn'tD．shouldn't
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