In the past decades, sea ice ______ in the Arctic as a result of global warming.
We play sports on school days. You know, we don’t have enough time and have to do lots of homework.
Excuse me, but is that my passport?—Oh, sorry, I took ________ by mistake.
Must we keep the room_______ all the time? —No, you don’t have to.
Women’s Day is on of March.