Polar bears live mostly on __________ sea ice, which they use as __________ platform for hunting seals.
These teenagers don’t know much of the world yet; that’s why they are so easily _____.
It is the interaction between people, rather than the events __ occur in their lives, __ is the main focus of social psychology.
Harry, would you _____ the story at the point where John left off yesterday?
It is reported that there is going to be a heavy rain, so I am forced to __ my visit.
--- With so much work to do, I don’t think I can take it any more.---______. Things will get better.