14/14, BUT...
In 4 the subordinate clause is conditional, not the sentence.
In 5 the 'correct' answer seems to me to be a subordinate phrase, not a clause. I thought a subordinate clause had to contain a finite verb.
I agree there is confusion between grammatically and orthographically in 10. The same error occurred in one of the 'Two Brains' questions in last Saturday's Times
Why doesn't Starmer hold another referendum?

A glass of pure water with a splash of vodka would be polluted by the vodka but it wouldn't be unhygienic. What's wrong with unhygienic anyway? 

