12 sentences I need major help with

Could you please help me with this?

1 Whats the age difference between the 2 youngest siblings?
2 There is no guy who's as pretty as her/as she is pretty.
3 At the time that I wrote the message I wasn't in my normal state of mind.
4 If he gets run over while in my care, I'll get in trouble.
5 I've spent more money in stamps than in postcards.
6 Its normal that he wants to see the product before buying it.
7 He used the word xx to mean yy,/but meant yyyy, which is why the sentence didn't make sense.
8 It has been brought to my attention that you are a lot like high school me used to be/like what high school me was like, which is very slutty.
9 A cheque is valid for 6 months as of/(as) from the date on it.
10 His wound is getting worse and worse by the day.
11 3 minutes till/to deadline.
12 Not in one movie does the hostage taker demanding money ever get it.

thanks