Русско-англо-русский юридический словарь

customs declaration – a statement showing goods being imported on which duty will have to be paid

Example: to fill in a customs declaration form (BusinessDictionary)

Fill in the form and send it back with your cheque. (Longman Dictionary of Contemporary English)

Parents at a school closed by an E. coli outbreak will be asked to fill in a questionnaire in a bid to track down the source of the illness. (BBC News)

Want to keep organised when you're back to school? Print out and fill in your own Malory Towers school timetable. (BBC)