Mr and Mrs Brown are going to Beijing with their son Jim.　They're going there by plane. The plane is going to start at twelve. It's ten o'clock now. They're waiting for a taxi. But there's no taxi going by. At a quarter to eleven, they get on the taxi. They ask the driver to drive fast. On the way there is a traffic accident(交通意外). The taxu can't move. They get off the taxi and walk to the airport. They get on the airport at half past eleven. When they sit down on the plane, it's 12:00. But there's something wrong with the plane. They have to get off the plane and get on another one again. They look happy because they get to Beijing.