根据所给汉语完成句子。

1. 最受欢迎的飞机是波音747。 

                                                  plane is the Boeing 747.

2. 乘公共汽车旅行比乘飞机便宜得多。    

    It's                              to travel by bus than by plane.

3. 最流行的交通方式是渡船。  

    The most               way is                                  .

4. 从北京到天津最好的方式是乘火车。 

                                                          from Beijing to Tianjin is by train．