Samuel was at the thrift shop. (Hint: Where)

He had piled up seven books yesterday. (Hint: How)

He was going to buy all the books. (Hint: What)

He was going to buy all of the books. (Hint: How)

At the last moment, he changed his mind. (Hint: When)

At the last moment, he changed his mind. (Hint: What)

He put all the books back on the shelf. (Hint: Where)

He subscribed to seven magazines. (Hint: How)

The book was a biography of Stephen King. (Hint: What)

It was a biography of Stephen King. (Hint: Whom)