Over the past decades, sea ice ______in the Arctic as a result of global warming.
A. had decreased B. decreased
C. has been decreasing D. is decreasing
Bill was doing a lot of physical exercise to build up his______.
A. energy B. strength C. force D. power
—I wonder ______ you’ll water this kind of flower.
—Every other day.
A. how often B. how long C. how soon D. how much
. She brought with her three friends, none of ______ I had ever met before.
A. them B. who C. whom D .these
. — Why does the Lake smell terrible?
—Because large quantities of water______.
A. has polluted B. have been polluted
C. has been polluted D. is being polluted
Peter’s jacket looked just the same as Jack’s, but it cost ______ his.
A. as much twice as B. as twice much as
C. much as twice as D. twice as much as
