"The cat is eating the food."
Translation:Kočka žere žrádlo.
It's not that simple. Czech has no articles, but sometimes uses "ten/ta/to" instead -- usually in situations where it could be unclear. If we know which cat and what food we're talking about, it's not necessary to "point" at them using demostrative pronouns, it's optional.
In the reverse exercise, "A cat is eating food" is also accepted.