Grammar practice worksheets focusing on articles 'a', 'an', and 'one' in English.

Exercise A: Write a or an in the blanks.

The choice between a and an depends on whether the word following it begins with a consonant sound (a) or a vowel sound (an).

#### Solutions:
1. an honorary degree
- "Honorary" starts with a vowel sound (/ə/).

2. a T-shirt
- "T-shirt" starts with a consonant sound (/t/).

3. an WHO initiative
- "WHO" is pronounced as /dʌbjuːˈdiːˈoʊ/, which starts with a vowel sound (/w/).

4. an X-ray
- "X-ray" is pronounced as /ˈɛks reɪ/, which starts with a vowel sound (/ɛ/).

5. a CIAA investigation
- "CIAA" is pronounced as /siːˌeɪ ˌeɪ ˌeɪ/, which starts with a consonant sound (/s/).

6. a happy man
- "Happy" starts with a consonant sound (/h/).

7. a hospital
- "Hospital" starts with a consonant sound (/h/).

8. a unit
- "Unit" starts with a consonant sound (/j/).

9. a unity room
- "Unity" starts with a consonant sound (/j/).

10. a UFO expert
- "UFO" is pronounced as /juː ˈɛf oʊ/, which starts with a consonant sound (/j/).

11. an hourly vigil
- "Hourly" starts with a vowel sound (/aʊ/).

12. a universal truth
- "Universal" starts with a consonant sound (/j/).

13. a PLA man
- "PLA" is pronounced as /piː ɛl eɪ/, which starts with a consonant sound (/p/).

14. an FBI agent
- "FBI" is pronounced as /ef biː aɪ/, which starts with a vowel sound (/ɛ/).

15. a UN mission
- "UN" is pronounced as /juː en/, which starts with a consonant sound (/j/).

16. a BBC programme
- "BBC" is pronounced as /biː biː siː/, which starts with a consonant sound (/b/).

17. an elephant
- "Elephant" starts with a vowel sound (/ɪ/).

18. an ewe
- "Ewe" starts with a vowel sound (/juː/).

19. a hornet
- "Hornet" starts with a consonant sound (/h/).

20. a horn
- "Horn" starts with a consonant sound (/h/).

Final Answer for Exercise A:

1. an honorary degree
2. a T-shirt
3. an WHO initiative
4. an X-ray
5. a CIAA investigation
6. a happy man
7. a hospital
8. a unit
9. a unity room
10. a UFO expert
11. an hourly vigil
12. a universal truth
13. a PLA man
14. an FBI agent
15. a UN mission
16. a BBC programme
17. an elephant
18. an ewe
19. a hornet
20. a horn

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Exercise B: Fill in the blanks with a/an or one, whichever is more likely or correct.

#### Solutions:
1. All the students passed the exam with just one exception; Rita.
- Here, "one" is used to specify a single exception.

2. She heard a bell ring in the distance.
- "Bell" starts with a consonant sound (/b/), so a is used.

3. I’ll finish the report in a day or two.
- "Day" starts with a consonant sound (/d/), so a is used.

4. A friend of hers sent her this card.
- "Friend" starts with a consonant sound (/f/), so a is used.

5. I only ordered one cold drink – take the remaining two back.
- Here, "one" is used to specify a single drink.

6. If you’re hot, would you like a cold drink?
- "Cold" starts with a consonant sound (/k/), so a is used.

7. He was able to jump from one rooftop to another and escape.
- Here, "one" is used to specify a single rooftop.

8. Apples cost Rs. 80 a kilo these days.
- "Kilo" starts with a consonant sound (/k/), so a is used.

9. This train is supposed to travel at 500 km an hour.
- "Hour" starts with a vowel sound (/aʊ/), so an is used.

10. He left home one evening, never to return again.
- Here, "one" is used to specify a particular evening.

Final Answer for Exercise B:

1. one
2. a
3. a
4. a
5. one
6. a
7. one
8. a
9. an
10. one

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Final Combined Answer:

Exercise A:
1. an
2. a
3. an
4. an
5. a
6. a
7. a
8. a
9. a
10. a
11. an
12. a
13. a
14. an
15. a
16. a
17. an
18. an
19. a
20. a

Exercise B:
1. one
2. a
3. a
4. a
5. one
6. a
7. one
8. a
9. an
10. one