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1.
1) He had remembered that  he didnt lock the door.
2)I had said he wrote the exercise last Monday.
3)The father had wanted who broke his favourite car.
4)The students had known that we bought radio-set.
5) I had come late at school because I missed the train.
6) When arrived at the party Tom had already gone home.
7) Her uncle had said he losed the key.

2.
Правдиво сказать, я считаю ошибочным это упражнение, приведу пример моего несогласия:
1)Моя сестра довольствовалась, поэтому что .. Чтоб во второй доли было время Past Perfect , то необходимо, чтоб было деяние, которое совершается после первой части(по медли), но что можно придумать, ведь у нее есть причина радоваться, и ее во 2-ой доли нужно указать, но временем Past Perfect  это невозможно! Пусть глядят эксперты, может, я не права.

3.
1) The cat ate all sausages before we had become home.
2) Mary had come when I read the book.
3) I had gone out gor a walk after I did my homework.
4) I had arrived at the party when my brother went home.