Xiao Hao is a fourth-grade primary school student with normal intelligence. His grades in Grade One and Grade Two are not bad, which belongs to the middle level, but after Grade Three, his grades began to decline. The fourth grade is more obvious. He doesn't listen carefully in class, and his homework is to deal with teachers and parents. Every time he finds papers and homework, he stuffs them into his schoolbag without looking. He doesn't care whether the teacher criticizes him or not. Xiao Hao likes watching TV and playing computer games. He wants to watch TV and play games after finishing his homework in a hurry every day. Parents are employees of an enterprise, and their education level is not high, so they have high expectations for their children's learning and have always been dissatisfied with their children's achievements.

1. What are the possible reasons for Xiao Hao's lack of learning motivation?

2. How to stimulate Xiao Hao's internal learning motivation and external learning motivation?

3. As a teacher, provide a set of practical and valuable implementation plans?