More bison were killed.The bison population is thought ______ from 60 million to just a few hundred between 1850 and 1910.
#96722
A
to have fallen
B
having fallen
C
to fall
D
falling
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Ann lent me an interesting novel________by Mark Twain this morning and I am very________with her kindness.
#95302
A
written;pleased
B
being written;pleasing
C
was written;pleased
D
to be written;pleasing
The _______ boy made the police and his family _______. 
#92633
A
gone; puzzled
B
missing; puzzled
C
missing; puzzling
D
lost; puzzling