4. Complete the following sentences with a/an or no article. (§ 10) 1. Once there lived very funny monkey. 2. Once there lived old man.

Explanation:

This exercise requires the use of articles 'a' or 'an' based on the initial sound of the following noun. 'Very' starts with a consonant sound, so 'a' is used before it. 'Old' starts with a vowel sound, so 'an' is used before it.

1. 'monkey' is a singular countable noun. 'very' starts with a consonant sound.
2. 'man' is a singular countable noun. 'old' starts with a vowel sound.