transmission, gearbox (mechanical assembly of gears that changes the torque and speed of shaft rotations)

picky eating

to eat with picky

hentaigana: any of the hiragana made obsolete in Meiji-era reforms that enforced having one hiragana for each syllable

admission to a school / annexation, incorporation

admit, transfer to a school / annex, incorporate

change, fluctuate

return to its owner, restore

restoration, the return of something to its owner

transformer (device that changes the characteristics of AC electricity)