Why don't all the Items in an Activity Set Match the Skill?

A child's ability to differentiate and review sounds is critical in developing phonics skills. In the case you note, it is important to recognize the sound the vowel makes, both in words that do not end in e and words that do end in e.

Thus, in lessons related to this skill, children are presented with a mix of items such as cut, cute, cap, and cape. And because we don’t want a child to assume that the answer will always be a long vowel word if it is found in a long vowel lesson, we vary the correct answer patterns.