Giúp em vs ạ em cảm ơn nhiều ạ

`14,` C 

- Dẫn chứng : The fastest way of travelling is by air.

`15,` A 

- Dẫn chứng : Modern trains have comfortable seats and dinning cars. They make even the longest journey enjoyable.

`16,` B 

- Dẫn chứng : Many people like to travel by car . You can make your own timetable.

`17,` A 

- Dẫn chứng : That is why travelling by car is popular for pleasure trips , while people usually take a train or a plane when they are travelling our business.

`18,` B 

- Dẫn chứng :

+) The fastest way of travelling is by air. With a modern airliner you can travel in one day to places which it took a month or more to get to a hundred years ago. (by air) 

+) Travelling by train is slower than by air, but it has its advantages. You can see the country you are travelling through. (by train) 

+) Some people prefer to travel by sea when it is possible. There are large liners and river boats. (by sea)

+) Many people like to travel by car. You can make your own timetable. You can travel three or four hundred miles or only fifty or one hundred miles a day, just as you like. (by car)