Вставьте вместо пропусков подходящие по смыслу слова 1. ____ became a part of our life. 2. Thousand...: ответ на тест 779582 - Английский язык

Вставьте вместо пропусков подходящие по смыслу слова
1. ____ became a part of our life.
2. Thousands of people travel every day either on ____ or for pleasure.
3. Of course, travelling by air is the fastest and the most ____ way.
4. Travelling by train is slower than travelling by plane, but it is ____ expensive.