A word that fills in the blank well is sarcastic Sarcasm is a type of irony, called verbal irony, that makes statements about a character that are obviously not true, and are included to add humor to the novel.
"Keep," this is because the adverb always modifies the verb, and a verb is a action, and keeping is an action.
The original one came out in 1971, so if that's the one you're talking about it was, Peter Ostrum. Hope this helps! :) :D (ps. let me know if this is not the version you were talking about.)
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“Our only chance of long-term survival is not to remain lurking on planet Earth, but to spread out into space.”- Stephen Hawkings
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Answer: doctors needed no legal documentation to prove they were doctors. And doctors used to perform medical procedure on stolen dead bodies. Those days fraud was on its peak in medical field.
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