许多现代城市面临着不平等这类复杂的社会问题。

Many modern cities face complex ___social issues like inequality.

政府提供必要的社会服务以支持有困难的家庭。

The government provides essential ___social services to support families in need.

污染不仅是环境危害，还会造成严重的社会问题。

Pollution is not just an environmental hazard; it also creates serious ___social problems.