Помогите с артиклями, пожалуйста)))
1. People can't live without ... air
2. ... air in London is smoggy.
3. ... gold is ... expensive metal.
4. ... gold they discovered is excellent.
5. I never drink ... water before breakfast.
6. ... water in ... Black Sea is salty.

1 ничего не меняй

2 The

3 ничего не меняй / an

4 The

5 any

6 The / the