The manager promised to keep me ____ of how our business was going on.

Lionel Messi，________the record for the most goals in a calendar year，is considered the most talented football player in Europe.                                  (2013·江苏，24)

It is said that ________ to classic music may be helpful in improving teenagers’ taste. 

— What has made him unhappy recently?— __________ alone to do the house work．

Knowing office rules, whether ______ or not, is always of great importance, especially for young job seekers.