7. When I (walk) _______ into the busy office, the secretaries (talk) _______ on the phone with customers, a clerk (work, busily) _______ at his desk, and two managers (discuss, quietly) _______ methods to improve customer service.

When I walked into the busy office, the secretaries were talking on the phone with customers, a clerk was working busily at his desk, and two managers were discussing quietly methods to improve customer service. *Объяснение:* *Walked* - Past Simple (завершенное действие) *Were talking, was working, were discussing* - Past Continuous (действия, происходившие в определенный момент в прошлом, когда кто-то вошел)