Fill in the blanks with for on since.1.We've been reading........two hours.2.I've been working in this office......a month.3.They've been living in craiova....1998.4.That man has been standing here...six o'clock.5.The twon has changed a lot....I was a girl.6.The central heating has been on....october.7.He has been very il....the last month.8.He hasan't been to the doctor.....last month.9.It has been very cold....early morning.10.I le has been waiting for her.......20minutes.