Answer and Explanation:
Why do you think Marissa has kept her career dream a secret?
I think Marissa has kept her career dream a secret because her family most likely sees such career as a "man's job." Several members from her family are mechanics, but not one of them is a woman. Marissa probably feels that something else is expected of her. She might be afraid of disappointing them.
How might she ask her grandfather for a summer job?
Marissa could speak to him in a way that shows how much she respects the job he does. She could tell him she has admired his skills since she was just a child, and that she has always dreamed of performing the same tasks as he does. She could say she knows it would make her happy, and that she will take it seriously.