A、They want to broaden their business. B、They are places for most people to date. C、They try to do something for single people.

In the past, young people in America usually lived with their parents until they got married. Some still do. But, in general, young people have grown more independent.They wait longer to get married.Even then, they still have to find the right person.
    There are many ways for people to meet. Some meet at work. Others meet by chance. Still others seek help from businesses that try to bring people together.
    Friends and family members might offer to help. Often a friend will plan a "blind date. " This is a meeting between two people who have never seen each other before. The friend thinks the two people will like each other. They might. Or they might never want to see each other again.
    Usually, though, single people have to make their own plans. Some might go to a dance place, for example, and hope to meet someone they can ask out on a date. Some places are popular with young people. Others are for older people. But this kind of life is not for everyone.
    Dating and establishing a relationship can be hard work. So a lot of people want to go where they are sure they can meet people with similar interests. They might look for someone who shares a common interest in religion or books, for example. A lot of bookstores in America now have places that serve coffee and food. Many offer special programs and social activities for single people.
20.What do we learn about American young people?
21.What is special about a blind date?
22.What do we learn about some American bookstores?