People started to travel long time ago. Now there are many companies which will help you. They will take care of your tickets and book everything is needed.
Вon't You speak in language of country you are going to? There are translators who will help you.
Modern level of service gives you a opportunity to travel around the world. You can choose a transport that you like : plane, train, ship, bicycle, or you can travel by your feet.
As to me, I like to travel by the car. It's very comfortable, because you can stop when you want, to better see the sights and nature. In addition, it is not necessary to buy tickets and walk with heavy suitcases. We went to St. Petersburg by the car, to see our friends and relatives. We spent very good time there. I love to travel, so much!
1b In those days - устойчивое выражение (=в то время)
2c For example (это единственный вариант из предложенных, на письме оделяемый запятой)
3a The sixties was the decade (структура предложения исключает другие варианты)
4c as (это часть фразы such as)
5a At (часть устойчивого сочетания at that time)
6b In (In the seventies - при указании периода времени используется только этот предлог)
7a decade (ед. число местоимения this исключает использование слов times и days)
8с for instance (единственное из предложенных устойчивое выражение в полном виде)
9b) like (остальные варианты приведены не полностью)
