1.    The classroom ______a cheerful busy atmosphere to the visitors.

A.   introduced     B. presented      C. awarded      D. delivered

2.   You can’t imagine what difficulty we had ______ home in the snowstorm. 

A.   walk         B. walked        C. to walk      D. walking

3.   “Oh, thank you for all your help”, he _______as he was leaving.

A.   counted       B. enlarged       C. added       D. joined

4.   It is ______ his help that we could have finished the task.

A.   except for      B. instead of      C. thanks to     D. rather than

5.   Although the chairs look alike, they ______ from each other in their constructions.

A.   differ         B. keep          C. learn         D. choose