Помогите пожалуйста! Очень вас прошу! Даю 20 баллов!

Раскройте скобки, употребив глагол в the Past Simple или the Past Continuous Tense.

1. He (write) a letter when I (see) him. 2. Harry (do) his work while his brothers (play) games. 3. The son (fall) down as he (run) for the bus. 4. We (sing) a song when John (come) into the room. 5. While a teacher (give) a lesson a small dog (walk) into the room. 6. When the phone (ring) I (work) in the garden. 7. My hat (flow) off when I (cross) the bridge.

1.was writing,saw2.was doing,was playing3.was falling,ran4.were singing,came5.was giving,walked6.rang,was working7.flew,was crossing