Mr Smith, who used to be a wealthy business man, lost everything that he __________ in the big fire.
_____ she was very tired, she went on working.
Busy _____ he was, he tried his best to help you.
I learned a little Russian _____ I was at middle school.
_____ we got to the station, the train had left already.
_____ the rain stops, we' 11 set off for the station.