3
The quality of doing something well and effectively, without wasting time, money or energy
5
Materials, sources of energy, wtc. will continue to exist or will grow again and are therefore never used up
6
Something that makes a place comfortable or easy to live in
7
Used when you are stating one definite fact in a situation that is uncertain or unsatisfactory
9
With many turnings
10
The part near the middle of a city, especially where the buildings are in a bad condition and the people are poor
12
Shown to the public
