An antonym for precursor is successor .
An antonym for interjection is long discourse .
Greetings!
The mouse ran up the clock.
If the audience is very young, the primary goal is to entertain. For older people, however, there are a variety of different things the writer could be trying to accomplish, such as persuading, entertaining, and even informing. For that, you'd have to look at the content.
Hope this helps, and have a nice day!
