Jack wasn't saying anything,but the teacher smiled at him ________ he had done something very clever.(2011·湖南)
Mr. Smith graduated from college at the age of 23, and ___________ he has been working as a teacher in a middle school.
While crossing the street, an old man was knocked down by a car and badly __________.
They are just human creatures in a human environment, trying to __________ themselves to a social situation.
__________ much difficulty we may meet with, we will finish the work in time.
Those flowers were ___________ for your mother on her seventieth birthday, but as she is away, I would be glad if you accept them.