1. For the first set, the word with the highlighted part pronounced differently is **plastic** (the "st" in "plastic" is pronounced as /st/, while in "listen," "costume," and "lost," it is pronounced as /t/ in "lost" and /k/ in "costume").

2. For the second set, the word with the highlighted part pronounced differently is **magazines** (the "es" in "magazines" is pronounced /z/, while in "foxes," "bottles," and "clothes," it is pronounced /s/).