Chapter 1:
1. John Glenn was born in: Cambridge, Ohio
2. John Glenn's nickname as a child was: Jiggs
Chapter 2:
1. John Glenn's first solo flight was in a: Piper J-3 Cub
2. During World War II, John Glenn flew: 59 combat missions
Chapter 3:
1. The name of the space program that John Glenn was selected for: Project Mercury
2. The name of the spacecraft that John Glenn flew into orbit: Friendship 7
Chapter 4:
1. The length of John Glenn's orbital mission: Approximately five hours
2. The name of the ship that recovered John Glenn and the Friendship 7 capsule: USS Noa
Chapter 5:
1. John Glenn's political role after leaving NASA: U.S. Senator from Ohio
2. John Glenn's second spaceflight took place aboard the spacecraft: Discovery
Chapter 6:
1. The purpose of John Glenn's second spaceflight: Study the effects of space on the aging body
2. John Glenn's accomplishments are celebrated at the John and Annie Glenn Home & Museum in: New Concord, Ohio
Remember, these answers are specific to the information provided in the mentioned Holt McDougal 6th-grade book. If you have a different edition of the book or additional questions not listed here, feel free to ask, and I'll assist you further.