There are many ways in which you can improve your study. But __________, you should work hard.
_____ 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.