The two sentences that use a noun clause are:
- Why they didn’t return any of my phone calls or emails is the question I want answered.
- Emily spent several days thinking about what she had to do in order to make a good grade.
Both sentences contain noun clauses that function as subjects or objects within the sentences. In the first sentence, "Why they didn’t return any of my phone calls or emails" is the subject of the sentence. In the second sentence, "what she had to do in order to make a good grade" acts as the object of the preposition "about."