Fix the two plural or possessive errors.
i
X
An
i
X
astronauts'
i
X
training
i
X
involves
i
X
much
i
X
more
i
X
than
i
X
just
i
X
academic
i
X
studies'

i
X
Before
i
X
beginning
i
X
space
i
X
training
i
X
for
i
X
instance
i
X
an
i
X
astronaut
i
X
must
i
X
be
i
X
able

i
X
to
i
X
swim
i
X
seventy-five
i
X
meters
i
X
without
i
X
stopping
i
X
and
i
X
swim
i
X
another
i
X
seventy-five

i
X
meters
i
X
in
i
X
a
i
X
space
i
X
flight
i
X
suit
i
X
and
i
X
tennis
i
X
shoes
ref_doc_title.

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