It is thought that one billion people I the world,  _   is half the word’s workers, earn their living by farming.
#94954
A
if
B
that
C
which
D
what
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It was the second time that I      the film.
#92188
A
have seen
B
saw
C
had seen
D
see
 I don’t remember how many years ago ____ I last showed you around the old campus.
#91962
A
it was that
B
was it that
C
it was which
D
was it when
      good manners to say “Sorry” when you knock into someone but    no need to say it again and again .
#92894
A
There are ; there is
B
It is ; there is
C
There is ; it is
D
It is ; it is