It is said that our body _______ 206 bones; if one of _____ is broken, it will cause inconvenience of some kind. 

Tom was about to close the window ___ his attention was caught by a bird.

I would rather _____ the weekend at home than ______ all the way to such a place.

__________ these tips, and your time _______ doing research on the Internet _________ much worthwhile.

I saw Helen at the party last month. It _________ a year since we met last time.