Question

Choose the correct words. The beginnings:
American sailors were the first to wear flared trousers in the 19th century.
1) days, trousers with a wide leg
below the knee were practical for many reasons. 2) ,
they were easy to roll up when cleaning the ship or to take off when they got wet.
Craze of the 1960s and 1970s:
3) when flared trousers became popular.
Many singers, such 4) Sonny and Cher, wore them.
5) that time, young people made their own flared trousers because shops
weren't selling them. 6) the seventies, you could buy them in almost
every shop. Hardly anyone chose a different style of trousers during this 7)
A comeback:
There were a few times when flared trousers came back, 8) ,
throughout the 1990s and in 2015. Although fashion designers, 9)
Balmain and Gucci, presented them during fashion shows, they didn't become as popular as in the 1970s.
1. a) In these b) In those c) On these
2. a) Such as b) Like c) For example
3. a) The sixties was the decade b) In the sixties c) These days
4. a) like b) of c) as
5. a) At b) When c) For
6. a) On b) In c) At
7. a) decade b) times c) days
8. a) example b) such c) for instance
9. a) such b) like c) instance
объяснить почему именно так, на примере каждого предложения.

Answer 1

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)