Crossword clues for Thing to fill out 4 letters:FORMThing to fill outAGAPThing to fill or bridgePOTHOLESThings filled by a highway crewLINEATop thing filled in on an I.R.S. formITEMSThings filling an agendaFREESPACEOnly thing filled in on the worst Bingo cardOMELETSThings filled at indoor stationsTALLORDERHard thing to fillGASTANKThing to fill upOPENINGSThings to fillQUOTASThings to fillNEEDSThings to fillGARAGEIt's often filled with things for which it was not intendedORDERSThings to fillTALLORDERTough thing to fillGELINSOLESoft thing to fill a clogPLANTBASEDLike a diet filled with Impossible things to eatWASHPOTLiquid-filled vessel in which to clean thingsMADEREPAIRSFixed things ... or, in four parts, what you've done when filling in 18-, 26-, 37- and 52-Across?