—I don’t know which skirt was ______, so I took them both.—Yes, it’s really difficult to choose.

— Which do you think is ______ subject, math, music or art?[— Art, I guess. 

Shanghai is bigger than ____city in Japan.

 Of all the stars, the sun is        .

More and more people have a low-C life and the air is getting much    than a few years ago.