exercise 13 Fill in the sentences with a, an or –.
1. –, a, a, an
2. a, an
3. an, a, a, –, a
4. –, –, –, a, a
5. a, a, –, (a)
6. an, –
7. An, a, a

exercise 14 Fill in the sentences with a, an or –.
1. the, –, the
2. –, the
3. the, –/the, a, the, a, a, the
4. the, a
5. the, the, the

exercise 15 Choose the correct alternative.
1. –
2. the
3. the
4. the
5. –
6. –
7. –
8. –
9. a
10. –
11. the
12. a
13. the
14. the
15. –
16. –
17. the
18. –
19. the
20. –