For 1, the complete subject is the busy volunteers. The simple subject would be volunteers. This is because the rest of the sentence pertains to the volunteers.
For 2, the complete subject would be each child in the family. This is because the rest of the sentence pertains to each child in the family.
Problem 3 is not available in the photo.
For number 4, the complete predicate would be could not wait to move in. Basically, the predicate is always everything but the complete subject-- which in this case would be the grateful family.
For number 5, the complete sentence is the family went on a picnic. This is because this sentence contains a subject, verb, and noun.
For number 6, the complete sentence would be sleep is important. In this sentence, sleep is the subject, is is the verb, and important is the adjective.