the food was bought two days ago.some of it____gone bad.为什么要

the food was bought two days ago.some of it____gone bad.为什么要填has而不是have呢
还有一篇是完形填空、开头是这样的.many children may be fond of animals ,but few everthink of making the study of animals their career,even fewer wil be recognized by the whole world ,___ the title of United Nations Messenger of Peace.横线处 答案说的是receiving ,我选的是giving ,我觉得应该是被给予这个称号啊,giving应该对的啊!