Still, he could not help thinking that if anything______, the nearest person he could contact by radio, if there was a ship nearby, would be on an island 885 miles away.
A. were happening
B. should happen
C. would happen
D. had happened
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Statistics from the developed countries suggest that it is only when peoples living standards begin to rise______to fall.
A. can birth rate begin
B. that birth rate begins
C. that birth rate should begin
D. then birth rate begins
Mothers can be seen leaving supermarkets with trolleys piled high with "junk food". Their
A. is
B. are
C. that is
D. those are
A subject which seems not yet______by doctors and psychologists is the influence of geography and climate on the psychological and physical health of mankind.
A. to have been studied
B. to be studied
C. having been studied
D. being studied
狗的尾巴还能表达感情呢。它一见主人,尾巴就会yao个不停。