THE NOUNS WITH THE PREPOSITIONS (HEALTH AND ENVIRONMENT)

I can't reply ... you right now.

I don't believe the stories ... ghosts.

The need ... reading books is important.

His fear ... flying made the travelling difficult.

There's no solution ... this problem.

His focus ... success has killed his social life.

Is there a difference ... these two?

Nobody seems to have responsibility ... this event.

My mum is an expert ... English.

I have some difficulties ... this task.