Final answer:
The sentence from the provided text that shows Malala's uncertainty about her location is: "Are we-in a cave?"
Step-by-step explanation:
The sentence that indicates Malala is not quite sure where she is can be found in the excerpt: "Are-you-there?" The girl's voice came low from the blackness. "Yes," he replied, and was conscious that his laboring breast made speech difficult. "Are we-in a cave?" This question suggests uncertainty about her surroundings, implying Malala does not have a clear understanding of her current location. The question, delivered in a hesitant manner, signifies a lack of surety and conveys her confusion.