Why didn’t you go to the cinema with us yesterday evening? —I________for my uncle from Beijing at the station.

I once lived in a house _______ roof has fallen in.

My mother was . I had to look after her . [ ]

Was it from Mary, _______ was working at a department store, ______ you learned the news?

He has read many books on history, so it’s _________ for him to answer these questions.