responsible 
英 [rɪˈspɒnsəbəl]  美 [rɪˈspɑnsəbəl] 
adj. 负有责任的；尽责的，负责的

例句：
Now I've learned that I don't have to be responsible for everyone. 

现在我懂得了我无需对每一个人负责。

He is responsible for finding the volunteers. 

他负责寻找志愿者。

She's responsible for booking the tickets. 

她负责订票。

The children were responsible for cleaning their own rooms. 

孩子们负责打扫他们自己的房间。

Try to find out who's responsible. 

搞清楚谁应该负责任。

The group was responsible for a wave of attacks. 

那个团伙对一轮袭击负有责任。