На словообразование:
9 use
10 mercy
11 just
the sentence was harsh – death by hanging. it was (9) … to appeal against it and no wonder: the (10) … killer could have no (11) … for his actions and consequently no defence . what was really unusual about the case is that the accused was a bull.

9 USE 10 MERCY 11 JUST

The sentence was harsh – death by hanging. It was (9) USELESS  to appeal against it and no wonder: the (10) MERCILESS killer could have no (11) JUSTIFICATION for his actions and consequently no defence . What was really unusual about the case is that the accused was a bull.