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fill にしようかfulfill にしようか迷ったけど、なんとなくfulfill がいい氣がした♡♡♡

違い参照: 

fulfill would be used for completing an action.

'He fulfilled his dream to travel Europe.'

'If you can't fulfill your duties, you will be fired.' 

basically, it's interchangeable with the word 'accomplish'

'fill' is more often used to literally mean to fill something. 

'fill up the gas tank!'

'I hope this will be enough to fill the whole thing.'