A、They enjoy having so much time alone. B、They deal with their fears by hiding. C、They often watch TV with their parents. D、They

For more than six million American children, coming home after school is equal to coming home to an empty house. Some deal with the situation by watching TV while others may hide, but all of them have something in common.(26)They who are called latchkey children spend part of each day alone and look after themselves while their parents work. And their bad condition has become a subject of concern.
    Lynette Long was once the headmaster of an elementary school. She said, " We had a school rule against wearing jewelry. A lot of kids had chains around their necks with keys attached. I was constantly telling them to put them inside shirts. There were so many keys, it never came to my mind what they meant. " Slowly, she learned they were house keys.
    She and her husband began investigating the children who had them. They learned of the impact working couples and single parents were having on their children.(27)Fear is the biggest problem faced by children at home alone. One in each three latchkey children is reported being scared and many had nightmares and were worried about their own safety.
    The most common way latchkey children deal with their fears is by hiding. It might be in a shower skill under a bed in a closet. The second is TV, and they’ll often play it at high volume. It’s hard to get statistics on latchkey children, the Longs learned. Most parents are slow to admit they leave their children alone.
26. What does the passage mainly talk about?
27. What does the biggest problem the children left alone at home have?
28. What can we know about the latchkey children?