--- May I smoke here?
--- If you , choose a seat in the smoking section.
A．should B．could C．must D．may
The government has taken measures air quality.
A．to improve B．improved
C．being improved D．to be improved
Thanks to Mr. Smith the father and the son eventually________after ten years' cold relationship between them.
A．took up B．made up C．looked up D．turned up
From the dates on the gold coin, we know that it was made 500 years ago.
A．marking B．marked C．to mark D．to be marked
Under such circumstances, it is little ________ that they experience difficulties.
A. pity B. shame C. relief D. wonder
I like _____ in the autumn when the weather is clear and bright.
A. this B. that C. it D. one
