It is a saying that children use to make a promise. They will draw an X<span> over their heart with their finger and say </span> "Cross my heart, hope to die."<span> They may also add </span>"stick a needle in my eye."<span> to make the promise stronger. This shows that they are extremely serious about it.</span>
Answer: The first sentence
<span>a Tell a story about rappelling into a cavern that can't be reached any other way.</span>
"Don't worry," she whispered.