With no one ___(turn to) for help,the boy had to start to look for food by himself.
问题描述：
With no one ___(turn to) for help,the boy had to start to look for food by himself.
答
turned to
由于没人能提供帮助，那个男孩只好自己去寻找食物。
答
turned to
因为没有可以向之求助的人，这个男孩不得不自己去寻找食物
答
填turned to（过去式）,因为后句用了had是过去式表示整件事发生在过去,所以用一般过去时
因为没有人可以求助,所以这个小男孩不得不开始自己寻找食物.