Fill in a or an case sharpener

1. "Attention, please! The boat is sailing in a few minutes."

2. Look at the timetable, our boat sails at 6.15.

3. Who is coming to dinner tonight?

4. Is Joanna Rowling writing a new Harry Potter book?

5. The timetable shows the next train, the 10.45 to Dover is leaving from platform 15.

6. When does the concert begin

7. We are playing a tennis match on Sunday.

8. I am getting a new computer for my birthday.

9. Harry always forgets his things at home!

10. Little Lillie always fights for independence! Just think of it!

11. We can't go to the sea. We are having our exams in the first week of June.

12. Mr Potter was sitting on the bench. It was so quiet around.

13. Mr Potter sat on a bench for half an hour and then began reading a paper.

14. I waited for Ann for an hour and a half and then left. It was useless to wait longer.

15. We were walking  all day long.  

16. We walked for ten minutes and then saw the palace.

17. Whenever I met Tom he was talking constantly about his grandson.

18. Something is wrong. Billy is so quiet!

19. The Thompsons couldn't understand why George was being so rude to them. He was generally nice to his clients.

20. The children didn't go skiing as it was snowing  from noon till evening.

21. Nobody could recognize Polly. She was being so nice trying to charm the guests.

22. Don't argue, please. I feel that you don't really mean it. You are just difficult.