The social security system refers to a social security system that provides material assistance and services to protect people's lives through the redistribution of national income and the support of social security funds under the management of the government in accordance with certain laws and regulations. Which of the following are within the scope of the social security system:. ['Laid-off workers applied for preferential loans with the help of street offices, opened their own factories and provided reemployment opportunities for many laid-off workers.', 'City leaders visited the lonely elderly in the city on the eve of the Spring Festival and sent them food, clothing and color TV sets, hoping that they could spend a warm and peaceful festival.', 'Uncle Lee, a retired employee, recently detected lung cancer. Surgery and other treatments cost hundreds of thousands of yuan. Most of the medical expenses are reimbursed by medical insurance agencies.', 'The development of the "Hope Engineering Library" project has enabled schools in remote mountain areas to have their own libraries, and children there can also read their favorite books.']