Answer:
<em>Era</em> means the span of time define for the purposes of chronology and historiography.
I would say C. “was”. It’s definitely not “am”, because that just sounds completely wrong. It’s not “are” because that sounds a bit wrong, too. It can’t be “were” because it’s only referring to one group, not many groups. The only answer it could be is C.
1.1 keep in touch with someone, make friends with someone, depend on someone,
2.1 reliable
2.2 depend on
2.3 antisocial
2.4 treacherous
3.1 he is friendly to Ruben
3.2 she never keeps in touch with us
3.3 if I don’t get on with my father, we don’t have a good relationship
3.4 I make friends are university
3.5 I rely on my boss
3.6 Donna is an old friend
5.1 in
5.2 out
5.3 get
5.4 in
5.5 went
5.6 get