Choose the most appropriate adjective.
We saw _____ birds at the zoo.

many

The correct adjective to use in the blank is many. The word many can be used to describe a large number of something. In this case, we saw many birds at the zoo, which means that we saw a large number of birds at the zoo.

The other options are incorrect.

• Much indicates a large amount or quantity of something, but it is not specific enough to describe the number of birds that were seen at the zoo.
• All means "every single one" and would not be appropriate in this context, as it is unlikely that all of the birds at the zoo were seen.
• None of the above is not an adjective.