Red pen at the ready

Is it neice or niece?
Does the period go inside the quotation marks or outside?
When do you spell out a number?
Their, they're or there?
Alot or a lot?
'Somewhat unique' is an impossible phrase. Why?
Just between you and I? Or just between you and me?
The squirrels who ate my garden or the squirrels that ate my garden...?

Are we having fun yet? Try SIX HOURS of this!!!

Okay, in the interest of full disclosure, let me admit that I signed up for this. Paid for it, in fact. The class is called "Proofreading," or, as we like to call it, "Spelling, Grammar and Punctuation for Anal People...and We Mean That in a Good Way."

Yes, I'm one of those people that gets a tiny but excruciating cramp in my brain when I see something spelled wrong in a national ad or hear someone use the wrong tense. Don't even get me started on 'ain't' and 'don't got none.' (involuntary shudder)

For those of you who can't help but be curious about the list at the top of this post, I'll let you get your aspirin before I give you the answers.

Is it neice or niece? Niece
Does the period go inside the quotation marks or outside? Periods and commas go inside the quotation marks.
When do you spell out a number? In general, numbers under 10 are spelled out (unless they deal with weights, ages, addresses, dates and a bunch of other exceptions.
Their, they're or there? Their is a possessive pronoun (refers to ownership). They're is a contraction meaning 'they are.' There is an adverb showing direction and can also be used as a pronoun.
Alot or a lot? No such word as 'alot.'
'Somewhat unique' is an impossible phrase. Why? Unique is one-of-a-kind. It can't be somewhat. Either it is or it isn't.
Just between you and I? Or just between you and me? You and me. Turn it around and see that it just sounds correct.
The squirrels who ate my garden or the squirrels that ate my garden...? That is correct. Who is used for humans and animals with a name. Unless you've named your squirrels, of course.

I'm actually quite good at this and I can't decide if I'm proud of that...or horrified.