The correct form.(help please)

Choose the correct form.
1.the criminal act of numerous factories dumping their waste into the rivers has led to (danger) (1) dangerously … high (toxic) (2) toxicity … levels.

2.pedro’s (ability) (3)… ability to hear his mother calling was blamed on a slight hearing (ability) (4)… disability which was eventually solved using a (revolution)(5) revolutionary…new technique from a sophisticated research laboratory.

Please i need your help to correct this text.since am training on last year’s school exam.
Thanks in advance.

It looks as if it has already been completed to me.