I don't think the experiment is _____ failure. At least we have got _____ experience for our future work on _____ nature.
_____ your classmates and you will make more good friends.
—What’s the matter with you, Sandy?—I’m _____ a bad cold. I think I am dying.
Have you _____ your things, Bob? The train is leaving at 2:30 this afternoon, so we don’t have too much time.
Try to _____ the children down. They’re too excited.
---What do you think of my article, professor?---The former part is well written but _____ is just so so.