If your best friend tells you his secret,it's ___ for you to keep them for him.By doing this,you can win others'trust.( )
special
necessary
possible
My uncle keeps many _________ on the farm.And I often help him feed them.( )
cow
horse
pig
sheep
Miss Green will teach _________ English next term.( )
they
them
themselves
their
She has _________ books than you.( )
many
much
more
most
This math problem isn't so difficult that I can work it out ________.( )
easily
usefully
loudly
quietly
John is _______ American student.( )
a
an
the
/