The sentences that should be included in a summary of the text are:
- John Fitch combined old methods of constructing boats with new technology to create the first steamboats.
- It wasn’t until after his death that Robert Fulton created a commercially successful steamboat and became known as “the father of steam navigation.”
- Fitch's boats cost too much to make.
The first and second sentences directly summarize key points from the text about Fitch's contributions and Fulton’s later success. The third sentence mentions a significant reason why Fitch was not credited, which is also important for a summary. The first sentence, expressing a personal opinion about riding a steamboat, is not relevant to the summary.