.  Three-fourths of the buildings ______.
A．was destroyedB．is destroyedC．were destroyedD．has been destroyed

. Early to bed and early to rise ______ a man healthy, happy and wise.
A．makingB．to makeC．makeD．Makes

. Mathematics ______ the language of science.
A．isB．has beenC．areD．have been

.  None of them ______ my friends.
A．isB．areC．wasD．has been

. Getting to other planets or to the moon _____ many problems.
A．involveB．involvesC．involvingD．to involve

. In that country, the rich ______ richer, the poor, poorer.
A．becomeB． has becomeC．becomesD．is becoming

. Not one in one hundred children exposed to the disease ______ likely to develop it.
A．should beB．must beC．isD．are

．Mother ______ us stories when we were young .
A．was used to tellB．is used to tellingC．used to tellD． used to telling

Every possible means ____, but none ____ successful．
A．has tried; has provedB．tried; proves
C．has been tried; provesD．is being tried; is proved

.More patients  ＿＿　in hospital this year than last year.
A．treatedB．have treatedC．had been treatedD．have been treated
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