It ______ we had stayed together for a couple of weeks ____ I found we had a lot in common.

 It is not where you graduated but ________ you have the ability to work out problems ________ counts.

 It is exactly ______he often fails in the exam ______ makes his parents worried about him.

--__________ was it_________ they discovered the entrance to the underground place?--Totally by chance.

 I just don't understand_______ that prevents so many Americans from being as happy as one might expect.