Use the indefinite article where necessary to complete the sentences.

1. What ... it was! I'll never forget it. 2. It is such ... , it'll take us hours. 3. What ... . We need your help with it. 4. It is such ... , you can always use it. 5. They are ... , four or five years old. 6. What ... ! 7. Such ... makes me really happy. 8. It is ... .