Re: Either of the restaurat is/are fine to me.
You will hear 1, 2, 3 and 4. As far as 5 goes, you could use "both" but only if you went to one of the parties. If you went to neither, then you didn't go to either.
Originally Posted by wotcha
To use "both", I would expect to hear something like "I was invited to two parties last week but I didn't go to both of them - I only went to the one that was a five-minute walk from my house". You are simply making it clear that you chose to go to one, but not both.
Remember - correct capitalisation, punctuation and spacing make posts much easier to read.