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Discover LudwigThe phrase "fill up fast" is correct and usable in written English.
You can use it to express that something is quickly becoming occupied or filled with people or things. For example: "Spaces at the most popular summer camps fill up fast, so you should sign up soon if you want to have a spot."
Exact(54)
The restaurants fill up fast.
The best places fill up fast.
Popular medical/financial externships fill up fast!
The best dates fill up fast.
Ditches and dents fill up fast with oozing groundwater.
Some day camps fill up fast; others don't.
Similar(6)
Their small stomachs fill up faster than you may realize.
Be aware, however, that some workshops fill up faster that their organizers can shut down registration for them.
Boris event filling up fast.
And Napier is filling up fast.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com