Choose the correct variant. I eat ... sweets. Now I have a toothache.

The correct variant is "many". So, the full sentence is: I eat many sweets. Now I have a toothache. Explanation: * "Many" is used with countable nouns (sweets). * "Much" is used with uncountable nouns. * "Little" and "few" indicate a small quantity, but they wouldn't lead to a toothache as directly as eating a large number of sweets would.