As a famous public figure, you have a duty to _________ yourself responsibly, especially in public places.

 Traditionally, local midwives would ________ all the babies in the area.

 I have an appointment      Dr. Smith, but I need to change it.

The system has been designed to give students quick and easy____. to the digital resources of the library. 

I can't _ him in the knowledge of wild plants．As a matter of fact, he' s an expert．