Kunci jawaban: 

In these sentences, you should use "an" before words that start with a vowel sound and "a" before words that start with a consonant sound. Here are the correct choices:

1. I eat a durian. (Even though "durian" starts with a consonant, it has a vowel sound at the beginning.)

2. This is a rambutan. (Rambutan starts with a consonant sound.)

3. This is a pineapple. (Pineapple starts with a consonant sound.)

4. This is a uniform. (Uniform starts with a consonant sound.)

5. That is an apple. (Apple starts with a vowel sound.)

6. My mom likes an orange. (Orange starts with a vowel sound.)

7. I drink a cup of coffee. (Cup starts with a consonant sound.)

8. This is a mango. (Mango starts with a consonant sound.)

9. She is a nurse. (Nurse starts with a consonant sound.)

10. I am a lawyer. (Lawyer starts with a consonant sound.)