A)

1. 2, 1

2. 2, 1

3. 1. 2

4. 1, 2 здесь ошибка самом предложении. Должно быть Alexandra used all the colours that the teacher had offered her.

5. 2, 1

B)

1. sang, had listened

2. had left, entered

3. ate, had cooked

4. hadn't heard, sang

5. sold, had bought

C)

1. was, had met

2. hadn't seen, visited

3. sent, had written

4. washed, had left

5. wore, had given