The factory has _____ workers due to the drop in sales, which will lead to an increase in unemployment. 

This book ____ 12 units, _____ the unit of Music. 

 Because of the lack of funds, the tunnel project has already fallen behind ________.

 In order to go to the palace ball, the pretty girl ____ herself ____ carefully.

Young students are ______ not to smoke both in and out school.