She advised us _____ carefully in her class.

The glass door have taken the place of the wooden ones at the entrance, _____ in the natural light during the day. 

The old man came         to the  railway station，only          the train was slowly pulling out of the station．

_______ his membership card, Tony decided to make a phone call to check whether there was something wrong．

 — It is understandable for him to make such mistakes.— You are right, ______ that he is only a new hand.