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Look at the first four paragraphs. Which of them tells us what Bobby's secret knowledge was? What were the two parts of that knowledge (one about his father's plans, one about his own plans)?
How is our curiosity about Bobby's secret knowledge built up before it is revealed? Two parts of the answer are given here. Find the third.
We see Bobby sitting firmly in the rocket in paragraph 26. When and where do we see him next? When do we learn why he is at home now instead of on the rocket? How does he explain it himself to his father?