Complete
with
since
or
for
.
I
have
been
reading
a
book
about
Niagara
Falls
____________________
May
.
He
has
been
travelling
in
China
____________________
five
months
.
My
parents
have
been
watching
a
programme
on
TV
____________________
seven
o'clock
.
They
have
been
filming
a
documentary
____________________
Saturday
.
The
forest
fire
has
been
burning
____________________
two
hours
.
