–You’ve got a stomachache? But we ate at the same place. How come my stomach is fine? --You have an iron stomach! Mine isn’t ___ strong.
---You keep on coughing. What’s the matter? ---Oh, I’ve got a cold. Nothing serious, _______.
---I’m sorry that I didn’t work out this problem. ---It’s _____our ability. I didn’t work it out, too.
John received an invitation to dinner, and with his work ______, he gladly accepted it.
— Is it OK if I take this seat? —Sorry,___________.
With so many problems____ , the newly-elected president had a hard time.