Six questions

Tag questions:
Negative questions

1. Washington DC is the Capital of the US, isn't it? Yes, it is
2. Isn't the White House over there? Yes, it is
3. It is a crowded city, isn't it? No, it isn't
4. There are many Mac Donalds in this city, aren't they? Yes, there are
5. The weather is reliable there, isn't it? No, it isn't
6. It is one of the safiest city in the US, isn't it? Yes, it is