1
-
Astronauts
like
to
____________________
the
space
.
2
-
____________________
the
door
before
you
enter
the
room
.
3
-
In
races
,
you
should
run
at
the
highest
____________________
.
4
-
Asteroids
____________________
by
our
solar
system
.
5
-
____________________
makes
our
lives
easier
.
6
-
A
____________________
means
that
something
is
strange
and
unknown
to
scientists
.
7
-
This
____________________
is
not
clean
.
Don't
put
food
here
.
