Advanced American English Quiz, Lesson 4; Part 1

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American English Quiz, Lesson 4. Part 1.
Which group includes consistent words?
rebate, partial refund, financial incentive
drastically, diagonal, rally, ecology
sparing, terminate, reject, harmless-looking
harsh questioning, violent, objections, commission

Which group explains “brush aside “?
itching to, eager, impatient, urge
abet, assist, aid, promote, facilitate
botanical, plants, infiltrate, benign
dismiss, disregard, superiority, indifference