My calculations were based on the ______ that house prices would remain steady.

— This second-hand table cost me only $10.— It was a real ______. Where did you buy it?

Jack is not very decisive, and he always finds himself in a ________ as if he doesn’t know what he really wants to do．

There is ______ in our office that when it is somebody’s birthday, they bring in a cake for us all to share.

According to a UN report，one third of the world population have no _________ to clean drinking water and health care.