No. "Author" isn't a proper noun; it's a thing, like "person" or "employee." Mark Twain would be capitalized, because his name would be considered a "proper noun," like "Earth" versus "planet."
No, you do not need to put an apostrophe in the word "hundreds" unless you are indicating a contraction or possession.
Yes. Use an apostrophe S if you are indicating possession.
You put the apostrophe in children's between the n and the s. Children is plural for child. Since children is plural adding the apostrophe s makes it possessive.
there is no apostrophe in the word cyclist.
The hammer of neither doesn't require an apostrophe.
Put the apostrophe in mices right after s.: mices'
No apostrophe is to be putted in this sentence.
Personally, no. But it's not incorrect to put the apostrophe.
"Volkswagen" doesn't require an apostrophe.
no matter what you usually have to put a period after an apostrophe because it's the end of a sentence.
' it's ' meaning ' it is'. e.g. 'It's over there' ; 'It is over there'. However, ' its ' is in the plural form and no apostrophe.
won't (:
I'd
No.
we'll
No, you do not need to put an apostrophe in the word "hundreds" unless you are indicating a contraction or possession.
dare'ot is how you spell dare not with an apostrophe