require prompt require proof require protection require public require quick require radical require real require refrigeration require registration require regular require regular maintenance require repeated require replacement require research require reservations require resources require review require revision require root require routine require sacrifice require security require senate require separate require service require servicing require similar require simple require skills require sleep require so much require some form require some time require someone require something require special require special attention require special care require special consideration require special equipment require special handling require special skills require specialist require specialized require specific require state require strengthening require strict require strong require substantial require supervision require support require surgery require surgical require sustained require that you require the addition require the approval require the consent require the cooperation require the development require the establishment require the following require the involvement require the presence require the provision require the same amount require the services require the unanimous require the use require the user require their own require them require thorough require time require training require translation require transport require treatment require unanimity require unique require up require urgent require urgent attention require urgent medical require us require use require user require users require very require very high require very little require very little maintenance require water require work require workers require you require you to do require you to register