1 . Sitting in the lecture hall          a number of committed teachers,         attention was on an outstanding teacher’s lesson.

A．were, their

B．was, whose

C．was, their

D．were, whose

2 . ______ that we had great trouble ______ it.

A．So difficult was the problem, to solve

B．Difficult as the problem was, solving

C．So difficult was the problem, solving

D．So difficult the problem was, to solve

3 . Hardly __________ when the waitress __________ sweet mint tea and appetizers for them.

A．had the diners sat down; would serve	B．the diners had sat down; served
C．had the diners sat down; served	D．the diners had sat down; was serving

4 . Only very rarely ________ attack larger mammals.

A．will it be

B．it will

C．will it

D．it will be

5 . 唯有重视科学民主之进步，方可在那个艰苦卓绝的年代造就勇于担当勇攀高峰的青年。（汉译英）

6 . So nice a girl _________ every girl and every boy in her class _________ help her when she is in trouble.

A．is she that; is willing to	B．she looks that; would like to
C．is she that; are glad to	D．does she look that; are willing to

7 . The business of each day, ________selling goods or shipping them, went quite smoothly.

A．it being

B．be it

C．was it

D．it was

8 . Only recently ___________using these plants to clean up soil and water in this area, one of most polluted sites that ___________polluted by heavy metals.

A．have investigators considered; have been	B．investigators consider; has been
C．investigators have considered; has been	D．do investigators consider; have been

9 . Never in my country _________such a thing.

A．I have heard of or seen	B．I had heard of or seen
C．have I heard of or seen	D．did I hear of or see

10 . Not until ________, ________ the camp site.

A．the sun went down; they reached	B．did the sun go down; they reached
C．the sun went down; did they reach	D．did the sun go down; did they reach