Let's complete the sentences using "a little" or "a few". "A little" is used for uncountable nouns, and "a few" is used for countable nouns.
1. We've got **a few** carrots in the fridge. Carrots are countable, so we use "a few".
2. There's only **a little** ... (We need more information to complete the sentence. Assuming it's referring to something uncountable, like juice: There's only **a little** juice left.)