In fact , the hazy weather problem is so severe now that it has aroused __________ nationwide concern about __________ environmental pollution .
_____ do you think of your English teacher?” “Oh, he is an _____ man.”
We don’t care if a hunting dog smells _____, but we really don’t want him to smell ____.
“Did Jim come?” “I don’t know. He _______ while I was out.”
“Look at these tracks. It _______ be a wolf.” “Don’t be so sure. I think it _______ be a fox.”
“Show me your permit, please.” “Oh, it’s not in my pocket. It ______.”