We have done half the work so far. _____, we’ll have finished it by December. 

Bicycling is good exercise; ____, it does not pollute the air. 

I think you’ve got to the point where a change is needed , _____, you’ll fail .

Yesterday I was walking downstairs when I missed my foot and had a bad fall, nothing serious, ______.

_____,I managed to get the game and the pain was worth it in the end.