A
definition
offered
by
Ko
and
Rossen
says
that
it
is
also
known
as
virtual
classroom
and
it
is
any
online
____________________
where
____________________
and
tutors
?
meet
?
and
interact
for
the
activities
offered
in
the
course
.
We
apply
this
term
to
environments
in
which
____________________
could
be
____________________
(
students
do
not
need
to
be
online
at
the
same
time
to
communicate
)
or
____________________
(
in
real
time
)
or
this
could
be
the
combination
of
both
(
Ko
&
Rossen
,
2010
)
.
