With our vowel pair work complete, we now return to some high-frequency words. Some of these don't fit neatly into any normal pattern (color, for example, breaks the pattern of how we would expect the or ending to sound); others are just so important that we wanted to practice them now.

The word Earth does need to be capitalized in this challenge level, as we are using it as a proper noun to name our planet (instead of as a common noun as a synonym for dirt).