I keep on getting a syntex error (comma) in query expression and I don't know why

[mattcibulka]

strSQL = "SELECT Origin, Destination, TransitTime, Cost FROM Shipments " _
& "WHERE TransitTime >= " & TransitTimeFrom CB & _
" AND TransitTime <= " & TransitTimeToCB & _
" AND Destination = " & DestCB & _
" AND Cost <= " & CostFromCB & _
" AND Cost >= " & CostToCB & _
" AND Origin = " & OriginCB