窮於應付

穷 = 力 + 穴 : Cupid (qu) exhausted (穷) his bank account and is very poor (穷). He has nowhere to go and nothing to do anymore. In the engine's kitchen ((e)ng2) he creates a big cave painting (穴) out of boredom. Idly he paints a big power button (力) wishing that upon hitting it, money would rain down on him.

于 = 亅 + 二 : Mnemonic symbol: prepositions (in, at, on, to, ...) are what glue the sentence together. Honey is as sticky as glue, so I'll represent 于 by a honey jar.

Yu the Great (于) was assigned to repair the electronics of the space station's kitchen (Ø2), but instead he was snacking honey from a honey jar (于). Unfortunately his capacitor (二) got stuck in the honey and now he has to use a crowbar (亅) to lever it out.

应 = 广 + ⺍ + 一 : Mnemonic symbol: from 应龙, responsive dragon. The responsive dragon knows every answer to every quiz question ever asked.

应 = 广 + ⺍ + 一 : Maud Younger and the responsive dragon want to peacefully take over engine: They skydive into engine's bathroom using two parachutes. On top of it, Maud Younger plays a flute, and the responsive dragon is waving with a daisy responding to the rhythm of the music.

付 = 亻 + 寸 : A paycheck.

付 = 亻 + 寸 : Rosa Luxemburg hands over Frieda Fox's paycheck in the bathroom of the space station, who of course "thumbs up".