Words on Wednesday - Word Squares

I'm starting a new series of posts, Words on Wednesday. Every Wednesday I'll hunt down some sort of word game, fun word site, or other language-related amusement and post it here, under the "Words on Wednesday" title.

Here's a nice word challenge I found today. Go ahead and try it -- it'll keep you young.

By the way, the answer to #1 is here, which you can peek at if you highlight the box just below. I'll leave the other 6 to you to solve.

A R I A
R I N G
I N T O
A G O G

Also, on puzzle #7, consider what might be even more cool about this answer, if the first word started with a different letter.