69.2. Complete the sentences using the following words. Use 'a/an' where necessary.

1. It wasn't your fault. It was an accident. 2. Listen! Can you hear music? 3. I couldn't get into the house because I didn't have a key. 4. It's very warm today. Why are you wearing a coat? 5. Do you take sugar in your coffee? 6. Are you hungry? Would you like a biscuit with your coffee? 7. Our lives would be very difficult without electricity. 8. I had an interview for a job yesterday. 9. The heart pumps blood through the body. 10. Excuse me, but can I ask you a question? 11. I'm not ready yet. Can you wait a moment, please? 12. We can't delay much longer. We have to make a decision soon.