8. o'neill worked as a merchant seaman before tuberculosis forced him to rest and educate himself. (1 point)
[underlined: "to rest and educate himself"]
a. prepositional
b. participial
c. gerund
d. infinitive (it's infinitive)

9. writing twelve one-act plays and two longer works kept him busy for two years. (1 point)
[underlined: "writing twelve one-act plays and two longer works"]
a. prepositional
b. participial
c. gerund (it's gerund)
d. infinitive

10. falling into three main phrases, o'neill's work grew stronger during his life. (1 point)
[underlined: "falling into three main phrases"]
a. prepositional
b. participial (it's participial)
c. gerund
d. infinitive