Final answer:
The four major benefits of the modern leisure-service system are recreation, education, communication, and satisfaction of citizens' needs for leisure activities.
Step-by-step explanation:
The four major benefits of the modern leisure-service system in the "Modern Leisure-Service Delivery System" model are recreation, education, communication, and satisfaction of citizens' needs for leisure activities.
Recreation encompasses activities such as watching television, participating in sports, owning pets, and engaging in hobbies. Education and communication refer to the opportunities to learn and connect through services like college, telephone, and computer software. Overall, the modern leisure-service system aims to meet people's needs for enjoyable recreational activities and enhance their quality of life.