1. I think charity is a good idea, because it can help people in need, such as poor countries or regions, so that their people can have food and clothing, so that they can provide them with the basic needs of daily life, such as food, clean water and clothes.
2. I have never participated in charity sponsored activities such as walking/swimming/running.
3. I used to sell flags to raise money for charities.
4. Yes, caritas is a famous charity in our country. They help the poor to build a fair society.