Question

1.She__(brush) his hair when the phone__(ring)

2.She was sleeping when I (walk)__in to the room

3. When I saw him, he__(prepare) for go home 

Answer 1

1. She was brushing his hair when the phone rang.
2. She was sleeping when I walked into the room.
3. When I saw him, he was preparing to go home.

Answer 2

1. She was brushing (brush) his hair when the phone rang (ring)
2. She was sleeping when I (walk) walked into the room
3. When I saw him, he was preparing (prepare) for (chỗ này là to chứ nhỉ) go home 

Answer 3

1, was brushing/rang

2, walked

3, was preparing