David asked his nephew to ______ his bag while he headed for a drink at the airport.

Mr Smith will leave school after he ________ his work this afternoon.

Where did you see him for the first time?— It was in the factory _________ we worked [ ]

下列文化常识表述中正确的一项是

on November 15, 2010 ______ a big fire happenedin Shanghai, ______ was a great shock to lots of people.