Help the stressed zookeeper complete the inventory report about the great penguin escape.

We started with fifty penguins, but right now most of them are swimming in the visitor fountain—at least forty! Thankfully, some of the baby penguins stayed behind in their nests, though we only counted five. The security team has no idea how the birds managed to pick the lock.

We started with fifty penguins, but right now most of them are swimming in the visitor fountain—at least forty!

Forty out of fifty is the majority (but not 100%), so "most" is the correct quantifier.

Thankfully, some of the baby penguins stayed behind in their nests, though we only counted five.

Five out of fifty is a small portion, making "some" the best fit. "All" would mean 100%, and "any" is typically used in questions or negatives.

The security team has no idea how the birds managed to pick the lock.

"To have no idea" is a common phrase meaning to not know something at all (0% knowledge).