Complete each of the sentences with a or an.

1. Poland is European country.
   
   
2. Fred has unusual job.
   
   
3. There is university in this city.
   
   
4. This is interesting book.
   
   
5. Susan is honest person.
   
   
6. They made horrible mistake.
   
   
7. There are 60 minutes in hour.
   
   
8. John wears uniform.
   
   
9. We have ugly dog.
   
   
10. That is useful machine.
    
    
11. Penny is intelligent student.
    
    
12. My sister works at hospital.