In the past decades, sea ice ______ in the Arctic as a result of global warming.
There are some warnings in some countries ______ over exploitation of underground water has caused the decline of wetland and increase of desertification.
This new English-English dictionary is useful for me. ______, I’ll buy it.
______ what your families said just now, I think, and you will make your own decision.
Chinese government should ______ taking action at once to defend the Diaoyu Islands.
______ watched the 2012 London Olympic Games agreed that some Chinese athletes performed perfectly, such as Sun Yang and Ye Shiwen.