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Help an alien tourist finalize their 5-star review of Earth on an intergalactic travel website.
The locals are fascinating! Humans are absolutely obsessed _________________________ _________________________ at small glowing rectangles all day.
They are also very polite. I watched one apologize _________________________ _________________________ into a plastic mannequin at the mall.
Humans are absolutely obsessed with staring at small glowing rectangles... ...apologize for bumping into a plastic mannequin...
Preposition + -ing: We say someone is obsessed with something, and we apologize for an action. Because with and for are prepositions, the verbs that come immediately after them must take the -ing form (staring, bumping).