Решение:
- 1. The building was designed by an architect. (Архитектор – деятель, который выполнил действие.)
- 2. The walls were painted with red paint. (Красная краска – материал, которым выполнено действие.)
- 3. The monument is visited by many tourists every day. (Многие туристы – деятели, которые посещают монумент.)
- 4. The pyramids were built by the Egyptians. (Египтяне – деятели, которые построили пирамиды.)
- 5. The statues were covered with mud. (Грязь – материал, которым покрыты статуи.)
Ответ: by, with, by, by, with.