Prepositions after adjectives

It's very kind __ you to help us.

Please be kind __ your sister!

I've always been afraid __ spiders.

She was very fond __ horses.

I'm afraid I wasn't very polite __ her.

It was polite __ him to hold the door for them.

His parents were bitterly disappointed __ him.

I remember when I was a child being very impressed __ how many toys she had.

I was very nervous __ driving again after the accident.

They don't seem particularly worried __ the situation.