阅读理解。 People travel to work in different ways. Some people go to work on foot because they live near their work places. Some people go to work by bike because they live farther away, or they like riding bikes. They think it's good for their health. Today more people have private (私人的) cars, so they can go to work in their cars. In the south of China, many people even go to work by boat because water is around their houses. Will people go to work by plane? I think so, if necessary (如果必要的话). (     )1. All people like to go work by bike. (     )2. Some people think it's good to go to work by bike. (     )3. Today more people drive to work. (     )4. In the north of China, many people go to work by boat. (     )5. The writer thinks some people will go to work by plane if necessary.