TOEIC Remedial 2 Prepositional Phrases

I am really happy ... them. They deserved to pass the test.

Are you concerned ... the upcoming TOEIC test?

I can't believe they blamed me ... the accident. It was Timothee.

I am telling you chocolate is good ... you.

Flavian has been interested ... them for a long time. I wish he would just say how he feels.

I am having difficulty ... this problem. Can you help?

I plan to retire ... 50.

Do you think Ryan is proud ... what he has done?

Do you think there will ever be a cure ... stupidity?

Do you know why Helena is upset ... Florian?