—What do cows eat? —They eat__________ grass.

I can't eat any more food, I am_.

—You see, “Food Safety” receives thousands of Internet hits a day.—Obviously, it has become one of the________ topics recently.

 －How about going on a school trip this weekend?－That sounds _____. I like going outside.

Shanghai is bigger than _____ in Jiangsu and bigger than _______ in China.