fall to
phrasal verbfall to somebody 
- to become the duty or responsibility of somebody(职责、责任)落在…身上;应由…做 - With his partner away, all the work now fell to him.他的搭档走了以后,工作现在全落在他的身上。 
-  it falls to somebody to do something It fell to me to inform her of her son's death.把她儿子死讯通知她的差事落在了我的头上。 
 
- With his partner away, all the work now fell to him.
fall to something 
- (literary) to begin to do something开始做;干起来 - She fell to brooding about what had happened to her.她开始愤愤地思忖着自己的遭遇。 
 
- She fell to brooding about what had happened to her.