四国犬

四 = 儿 + 囗 : Mnemonic symbol: a four-leaved clover. Socrates (s) is working out in the bathroom of the space station (Ø4). He's lifting four (四) wooden boxes (囗), and wonders why they are so heavy. He doesn't know that inside one of the four boxes, the monkey king (儿) is hiding and secretly laughing at him - until the monkey king comes out and surprises Socrates with a four-leaved clover (四).

国 = 囗 + 玉 : Mnemonic symbol: a nation's flag. Let's say the Chinese flag.

In the observatory's kitchen (o2) Gitta Giraffe (gu) is practising her ballet performance. She got a whole crate (囗) full of jade bracelets (玉) and flags (国) and fixed one flag to each jade bracelet. This makes a perfect combination for throwing the ring with the flag waving behind it and catching the ring again after a few pirouettes.

犬 = 丶 + 大 : Cupid (qu) wants to play fetch with the Saint Bernard dog (犬) in the anthill's living room (an3) and throws a petal (丶) over his head, but the dog just continues sleeping. Much to Cupid's surprise though, a big robot (大) happily leaps after the petal.

犬 = 丶 + 大 : Looks like a Saint Bernard dog with only one eye.