What is the simple predicate of sentence Mr. and Mrs. Kim spoke at an assembly our school.?

The simple predicate of the sentence "Mr. and Mrs. Kim spoke at an assembly at our school" is spoke.

Here's why:

* Simple predicate: This is the verb or verb phrase that tells what the subject does or is.

* Subject: In this sentence, the subject is "Mr. and Mrs. Kim".

* Verb: The verb "spoke" tells us what Mr. and Mrs. Kim did.

Therefore, "spoke" is the simple predicate.