Teacher:In this task, you're given an article and an answer. Your task is to generate the fill-in-the-blank question for this answer based on the given article. The blanks are always at the end of the question, and can be filled with more than one word or phrase.
Teacher: Now, understand the problem? Solve this instance: Article: Fly Alone for the First Time I began flying lessons at the age of 14; but the Federal Aviation Administration requires you to be 16 before you make flight by yourself. So I had to wait for two long years until I could fly a plane by myself. I used that time to master the basic maneuvers of flying. I learned emergency procedures and practiced hundreds of takeoffs and landings until I could land the airplane smoothly without bouncing it down the runway. It wasn't always easy, and many times I would come home feeling discouraged and thinking maybe everyone was right - I would never learn to fly, but by the next day, I was always eager to try again. On the day of my 16th birthday, I made my first solo flight, which meant I could finally fly alone. The night before, my dad, who was my flight instructor, explained that the winds were forecast to be high. He said if we were in the air by dawn, the winds would probably be calm enough for me to solo. The next morning it was cold, but the sky was completely clear, and the winds were calm. I expected my dad to stay in the plane for at least three takeoffs and landings. But after the first one, he told me to pull off the runway, and he got out of the plane. I was alone. As I climbed higher and higher, the world began to change. Everything on the ground became _ . Houses, cars, and all looked like tiny toys that could fit in the surface of my hand. I made three takeoffs and landings that day. Each landing was perfect. It was one of the happiest days of my life. Today, as a flight instructor, I stand alongside runways watching as my own students take to the sky on their first solo flights. I understand the joy faces, which always bring me back to that day when my dream came true. I learned that no matter how people tell you that you can't do something, if you believe in yourself, you can succeed.
Answer: sometimes doubted his ability to fly
Student:
When practicing flying, the author _ .