Select all sentences that correctly mark the stated agent with by or the stated instrument with with.
The foreword was revised by the volume's editor, who did the work.✓Ճիշտ պատասխան
The loose paint was removed by a steel scraper used as a tool.
The wax was lifted with a narrow scraper used as the instrument.✓Ճիշտ պատասխան
The field recording was made with a visiting sound engineer acting alone.
Բացատրություն
The editor is correctly introduced by by as the person acting, and the scraper is introduced by with as the tool used. The erroneous sentences reverse those semantic roles.