1) Alec wasn't conscious his wife's unhappiness.
CORRECT! CONSCIOUS + OF
2) Our Prime Minister is skilful making deals with politicians.
CORRECT! SKILFUL + AT
3) The cacti are unique the archipelago, but many have been strangled by vines.
CORRECT! UNIQUE + TO
4) Arthur was rather bored his life in a small village.
CORRECT! BORED + WITH | OF
5) My cat is crazy water, which seems to be very strange.
CORRECT! CRAZY + ABOUT | OVER
6) I'm continually astonished the choices other people make.
CORRECT! ASTONISHED + AT / BY
7) They're usually fairly prompt dealing with enquiries.
CORRECT! PROMPT + IN
8) How to train a puppy to be friendly other dogs?
CORRECT! FRIENDLY + WITH
9) He was officially declared innocent robbery and murder 5 years after he was convicted.
CORRECT! INNOCENT + OF
10) Amelia was very upset failing her exam.
CORRECT! UPSET + ABOUT | AT | OVER