_____ that air conditioners cause so much pollution, I would never have bought one.

Although the doctor is claiming a major breakthrough in the fight against cancer, I am of his chances of curing the patients.

The number ofgiant pandas is getting _________ because their living areas are becom­ingfarmlands.

Hearing footsteps outside the door, she ______ her talk to another topic.[ ]

I’m sorry to keep you waiting.— It doesn’t matter. I ____ here for only a few minutes.