Mother bought a lot of things _____ her daughter's birthday party.
Over the past decades, sea ice ______in the Arctic as a result of global warming.
Bill was doing a lot of physical exercise to build up his______.
—I wonder ______ you’ll water this kind of flower. —Every other day.
. She brought with her three friends, none of ______ I had ever met before.
. — Why does the Lake smell terrible? —Because large quantities of water______.