Answer:
The function will have been attended by them.
Explanation:
1. Natasha was especially interested in <span>dinosaurs; </span>however, Jorge wanted to check out the huge collection of precious gems.
You need to use a semicolon before however because you are connecting two independent clauses into one compound.
2. Natasha <span>gazed
into a replica of a cooking fire and began to imagine sounds: a crying
baby, the persistent click of stone on stone involved in making scraping
tools, and the thunderous cry of a mastodon.
You need to use a colon to indicate that a list will ensue.
</span>