1. I can't help but wonder (about / for) what my old friend is doing now. 2. Water is ( on/ in) short supply so we shouldn't waste it. 3. The tribesmen are free ( from /for ) worries as they don't think about the future. 4. I often disagree ( on / with) my parents about politics. 5. Tim really cares ( for /about ) the feelings of others. 6. Mike didn't pay attention ( to /at ) his teacher's instructions and failed the assignment. 7. Sue was excited to finally meet her pen - friend ( in / at ) person. 8. Mark is often indifferent ( to /of ) people's feelings.