It looks like you're looking for the most appropriate word to fill in the blanks in your statements. Here are the sentences with the best-fitting words:
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A country may not join the European Union for fear of losing some of its ability to make national decisions.
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A country with a weaker economy may not join the EU for fear of the financial burden involved with bailing out countries with weaker economies.
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A country may join the EU in hopes of improving its economy, democracy, and cooperation with other European nations.
So, the correct words are:
- decisions
- weaker
- improving