One monster arrived, now that was enough.
Second monster entered, that was really tough.
Third monster popped in, we have a crowd.
Fourth monster walked in, they're awfully loud.
Fifth monster dropped by, it's more than plenty.
Sixth monster stepped in, they are really messy.
Seventh monster barged in, he was really tall.
Eighth monster showed up, no room at all.
Ninth monster came, what should I do?
Tenth monster appeared, let's visit the zoo.