13. His dream of opening ( a / an / X ) business had become ( a / an / X ) reality.

14. Since 1986 they have been running their grocery business at ( a / an / X )profit.

15. There was ( a / an / X ) heavy traffic in the main street.

16. In ( a / an / X ) emergency please dial 999.

17. Being ( a / an / X ) only child, Peter thought it was fun to pay ( a / an / X ) visit to his cousins.

18. If you have ( a / an / X ) headache, you are unlikely to have ( a / an / X ) good appetite.

19. I need ( a / an / X ) paper in order to take notes at the lecture.

20. He has just written ( a / an / X ) paper on fibre optics.

21. We thought that Peter's losing the competition was such ( a / an / X ) bad luck, but he shrugged it off with ( a / an / X ) laugh.

22. ( a / an / X ) Laughter and tears are ( a / an / X ) part of ( a / an / X ) long life, Grandpa had said.

23. It is usual here for students to share ( a / an / X ) apartment.

24. Have you got ( a / an / X ) driving licence?

25. The water was on ( a / an / X ) level with the river banks.