Câu trả lời:
1. When she (come)___came______into the room, I (listen)………was listening……….to music.
2. I (phone) ……phoned……her when her mother(go)……..was going…….home.
3. While Lan(write)………was writting…..a letter, her brother (do)………was doing……..his homework.
4. They (play)………were playing…..tennis while he (practise)………was practicing……music.
5. We (eat)………were eating…………candy whe the teacher(appear)…………appeared……