Answer: The excerpts that serve to entertain the reader are 1 and 4.
Step-by-step explanation: The mode of writing of texts that serve to entertain the reader is narrative. Narrative writing presents fictional or non-fictional events and places them in a particular setting. Excerpts 1 and 4 have been taken from a narrative texts, that is to say imaginative stories; therefore, their purpose is to entertain the audience. In contrast, excerpts 2 and 3 are part of expository texts. Unlike narrative texts, the main objective of expository texts is to inform the readers.