We
have
____________________
expanding
our
business
over
the
past
two
years
.
I
____________________
been
phoning
her
all
morning
.
He
____________________
been
trying
to
contact
the
supplier
all
morning
.
I
have
____________________
waiting
for
half
an
hour
!
Trade
between
our
countries
____________________
been
increasing
steadily
.
