Read the last part of the text and answer the questions

Accomplishing administrative duties and diligently completing paperwork are generally a requirement for social workers, no matter what their specialization is. Social workers are generally employed from 9-5, but those who offer emergency services in hospitals and other industries can also be assigned to shift work. For many social workers, outside visits and meetings are a constant challenge, as well as high case loads and understaffing. These obligations can often make it seem as though a social worker’s job is never done, but the most successful professionals relish the challenge. Many social workers find that despite these obstacles and the difficulties presented by these strains, this field can be a very satisfying career path.

1. 
   Why are administrative duties and paperwork a necessary requirement for social workers?
   
2. 
   How long does their working day usually last?
   
3. 
   Why do they sometimes work shifts?
   
4. 
   What other problems may they have?
   

Exercise 4. Fill in the blancs with the proper variant A,B or C.