Answer:
Click bait, it reels me in every time.
I believe the correct answer would be him.It would make more sense than His knowing the combination to the lock came in handy. and Him <span>knowing the combination to the lock came in handy.
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I would need to see a picture of the actual problem to answer but id you’re looking for an explanation as to what you need to do read the poem and connect the lines to the one that describes the feeling of the poem.
I may be too late, but if you're looking for an ending, you should tie up a few loose ends, and leave it on a cliffhanger. If you're not allowed too, then you may want to tie [mostly] everything up. I'm sorry that I'm bad at writing..