In order to look after her sick daughter, the old lady asked for a week’s ________.

Ancient Greeks were responsible for many of the _______ in science and other fields．

People who are infected with HIV are often looked down upon because social _____ against the disease runs so deep.

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

 He is _______as a leader but he hasn’t ________in teaching.