Complete the wizard's daily routine diary. Choose the correct word to fill in the blank.

To keep the invisibility spell working, I have to drink a terrible swamp-water potion ___ morning.

The correct answer is every.

We use every with singular time words (like "morning", "day", "year") to talk about how often something happens—meaning it repeats daily. If we said "all morning", it would mean he spent the entire duration of the morning drinking the potion non-stop!