Question Kate wanted to know what was in the letter and , but the voice teacher insisted it was .
Answers whose it was, intimate
who it was from, confidential
who was it from, clandestine
whose was it, undercover

Kate wanted to know what was in the letter and who it was from, but the voice teacher insisted it was confidential.

1. "whose it was, intimate" is incorrect because it obviously belongs to the teacher (unless she stole it).

3. "who was it from, clandestine" is incorrect because clandestine means "kept secret or done secretively, especially because illicit." I doubt a letter would be illicit, and if it was, the teacher would be smarter than to have it out in front of Kate.

4. "whose was it, undercover" is incorrect because I doubt that grammar is correct. Also, a letter cannot be undercover, and if it was, Kate's teacher would not have told it was undercover, otherwise it would no longer be undercover.