his
16. no underlined thing
17. lets ride the sled down the hill
18. nothing is underlined
19. a word or phrase that modifies or qualifies an adjective, verb, or other adverb or a word group, expressing a relation of place, time, circumstance, manner, cause, degree, etc. (e.g., gently, quite, then, there ).
20. After the record snowfall, our mood turned sour.