The students ______ to write English words carefully from the beginning.
---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.