Most
people
know
that
Mount
Everest
is
the
____________________
mountain
in
the
world
.
However
,
there
is
another
fact
that
many
people
don
?
t
know
:
it
has
become
one
of
the
____________________
mountains
in
the
world
.
Mount
Everest
is
one
of
the
____________________
and
most
____________________
mountains
to
climb
on
Earth
.
It
is
not
the
____________________
or
the
____________________
place
on
Earth
,
but
it
comes
close
!
These
challenges
make
it
one
of
the
most
____________________
mountains
for
serious
climbers
.
Since1952
,
over
3500
climbers
have
reached
the
top
.
Unfortunately
,
____________________
of
them
have
left
equipment
and
trash
on
the
mountain
.
In
fact
,
trash
is
now
one
of
the
____________________
threats
to
the
environment
on
Mount
Everest
.
Local
organizations
have
brought
tons
of
trash
down
from
the
mountain
.
One
of
the
most
____________________
projects
handed
over
more
than
a
ton
of
tin
cans
,
glass
bottles
,
and
old
climbing
tools
to
artists
in
Nepal
.
The
artists
used
the
trash
to
create
works
of
art
.
Then
,
they
sold
the
art
to
raise
money
for
local
charities
.
1
The
____________________
expensive
work
of
art
cost
$17
,
and
the
____________________
____________________
one
cost
$2400
.
