Question

1. complete the sentence. let me know ____ it is time to eat. pretty when her his

Explanation:

To complete the sentence "Let me know ____ it is time to eat", we need a word that introduces a time - related clause. "pretty" is an adjective or adverb and doesn't fit here. "her" and "his" are possessive pronouns and also don't fit in the context of introducing a time - related clause. "when" is a conjunction that can be used to introduce a clause about time, so it is the correct choice.

Answer:

when