Answer:
16. Homeless. Homely
17. lasting. lastly
18. Upon. Up
19. Mournfully. Mournfully
20. Childish. Childishly
See below
Step-by-step explanation:
Remember that all "-ly" words are adverbs.
"Up" acts as preposition as well as an "adverb of place".
Suffixes are the ending words
See the attached file
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