ASTRONOMY
1
.
The
Sun
and
the
planets
orbiting
it
make
up
the
____________________
____________________
.
2
.
The
Moon
makes
one
complete
____________________
around
the
Earth
in
approximately
27
.
3
days
.
3
.
It
was
discovered
in
the
20th
century
that
the
____________________
is
expanding
.
BIOLOGY
1
.
The
smallest
organisms
consist
of
one
____________________
.
2
.
there
approximately
one
million
known
____________________
of
insects
of
earth
.
3
.
in
the
last
Biology
lesson
,
we
had
to
draw
and
label
various
internal
____________________
:
the
liver
,
kidneys
,
and
so
on
.
CHEMISTRY
1
.
Maria
Sklodowska
-
Curie
discovered
the
____________________
____________________
polonium
and
radium
.
2
.
In
1785
Antoine
Lavoisier
demonstrated
that
water
is
a
____________________
of
hydrogen
and
oxygen
.
3
.
A
____________________
of
hydrochloric
acid
consists
of
one
atom
of
hydrogen
and
one
of
chlorine
.
MATHEMATICS
1
.
In
secondary
school
we
learned
to
solve
quadratic
____________________
-
at
least
some
of
us
did
.
2
.
In
the
expression
ax2
+
bx
+
c
,
a
,
b
,
and
c
are
coefficients
and
x
is
the
____________________
.
3
.
The
Cartesian
____________________
____________________
allows
you
to
describe
every
point
on
a
plane
using
a
pair
of
numbers
.
PHYSICS
1
.
____________________
is
the
force
with
which
objects
with
mass
attract
one
another
,
described
by
Newton
.
2
.
The
____________________
of
light
is
constant
;
it's
value
is
299
,
752
,
458
metres
per
second
.
3
.
The
electron
is
an
____________________
____________________
with
a
negative
charge
.
