Answer:
1. A: Why did Michael call so early this morning? B: I have no idea why he did that.
2. A: Where did Yu say the new office is going to be? B: I don't remember where he said the building will be.
3. A: Why did Emily cut her hair? B: I don't know why she would cut them.
4. A: How long is this going to take? B: I'm not sure how long it will be.
5. A: How much is this going to cost? B: I have no idea how much this will cost.
Step-by-step explanation:
A noun clause is a clause/ phrase that contains a subject and a verb in it. It also functions as a noun in the sentence, more specifically starting with the words such as "how, why, who, where, what, which, whether" etc. among others.
In the given exchanges between person A and person B, the noun clauses for the respective sentences/ exchanges are-
1. why he did that.
2. where he said the building will be.
3. why she would cut them.
4. how long it will be.
5. how much this will cause.
They all start with the words that are for noun clauses and also have verbs in each of them.