Complete with for or since.
They've lived in this house ___ six months.
Mr Smith has had this car ___ years.
She's been in our class___ October.
I haven't seen John ___ Monday.
I haven't seen John ___ days.
They've been in Italy ___ 1998.
They've been in Italy ___ a week.
Janet has worked in this office ___ 1994.
I haven't talked to David ___ last week.