2. Humans don't live/ haven't lived în caves for thousands of years. 3. Architects have supported environmentally friendly housing for/since the last 20 years. 4. We have had the option of solar heating since/for the 1980s. 5. Town planners haven't been keen on high-rise flats for/since more than 20 years. 6. Properties in this area are/have been expensive since they filmed Nottingham Hill here.
