The letter "Y" is considered both a vowel and/or a consonant.
Answer:
Topic Sentence for Paragraph 2:
Goddard was able to make great contributions to the field of engineering after receiving modest support from a few sources.
Topic Sentence for Paragraph 3:
He thus began his lifetime of dedicated work.
Closing Sentence for Paragraph 4:
Goddard's acclaim partially stems from his work developing the first rocket using liquid fuel.
