try hard to be social = try to be pleasant to people, go out, talk to people , make conversation= “努力为社会”

It means opposite of being shy. Does that help? My Chinese is not that good yet, but I found 酬应 in dictionary: http://www.iciba.com/%E9%85%AC%E5%BA%94/

"try hard to be social"

to be social = to be able to talk to other people