1. The house (was locked) up when they set off.
2. The house (had been locked) up before they set off.
3. He wished to know if his instructions (had been carried) out.
4. Talking of Susan, Milly (was reminded) of something she had once (been told).
6. Wherever I went I found that the camp (to have been left) in a disgraceful condition.
7. Wherever I went I found evidence that the camp (had been left) only a short while before we arrived.
8. From where I stood the house (was hidden) by lime trees.
9. Everything (was prepared) for the ball. The front lawn (had been floored) and (tented); palms and azaleas (had been placed) round it.
10. Dan had a car waiting, and open country easily (to be reached) in those days.
11. Looking over his shoulder I saw that the note (was written/had been written) in pencil and on a whole sheet of paper. Оба варианта приемлемы.