51. i've kept up a friendship with a girl whom i was at school _____ twenty years ago.
a) about
b) since
c) till
d) with

52. he wasn't asked to take on the chairmanship of the society, _____ insufficiently popular with all members.
a) being considered
b) considering
c) to be considered
d) having considered

53. _____ for the timely investment from the general public, our company would not be so thriving as it is.
a) had it not been
b) were it not
c) be it not
d) should it not be

54. the social security retirement program is made up of two trust funds,_____ could go penniless by next year.
a) the larger one
b) the larger of which
c) the largest one
d) the largest of which

55. nowhere in nature is aluminum found free, owing to its always _____ with other elements, most commonly with oxygen.
a) combined
b) having combined
c) combine
d) being combined

56. andrew, my father's younger brother, will not be at the picnic, _____ to the family's disappointment.
a) much
b) more
c) too much
d) much more

57. i would have gone to visit him in the hospital had it been at all possible, but i _____ fully occupied the whole of last week.
a) were
b) had been
c) have been
d) was

58. help will come from the un, but the aid will be _____ near what's needed.
a) everywhere
b) somewhere
c) nowhere
d) anywhere

59. the chief reason for the population growth isn't so much a rise in birth rates _____ a fall in death rates as a result of improvements in medical care.
a) and
b) as
c) but
d) or

60. he claims to be an expert in astronomy, but in actual fact he is quite ignorant on the subject. _____ he knows about it is out of date and inaccurate.
a) what little
b) so much
c) how much
d) so little

答案：51.d 52.a 53.a54.b 55.d 56.a 57.d 58.c 59.b 60.a