Необходимо воткнуть предлоги at, in, on.

1)At
2)In
3)On
4)On
5)At
6)In

1. I Iive at 24 Primrose Street.
2. My mother lives in a big block of flats in London. 
3. Janet's flat is on the ground floor.
4. Where is the toilet, please? On the second floor.
5. ls there a doctor near here? Yes, at 17 High Street.
6. They lived in America in 2000.