Choose the correct options

1. I'm a bit of a failure [at|for|in|of|on|to] playing tennis.
2. I'm not having much success [at|for|in|of|on|to] doing business.
3. A sudden rise in oil prices could lead to a breakdown [at|for|in|of|on|to] the economy.
4. He made the last attempt [at|for|in|of|on|to] the vain hope he might win.
5. His company went bankrupt due to the loss [at|for|in|of|on|to] investments.
6. He wanted to ask for an advance [at|for|in|of|on|to] his promotion.
7. This is simply a regression [at|for|in|of|on|to] outdated attitudes.
8. It was a tremendous diplomatic triumph [at|for|in|of|on|to] such a small country.