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II.

1.had never seen

2.remembered-had forgotten

3.had sold

4.You had put-went

5.haven't seen

6.had done

7.realized-had forgotten

8.haven't seen

9.arrived-has just gone

10.was-had met

III.

1.arrived, David had gone home.

  David had gone home, we arrived.

2.we had had a look around the shops, we had snack.

3.began to work than the light failed.

  they began work than the light failed.

 did they begin work when the light failed.

4.happier than before.

5.I went to the zoo last year, I had never seen a real tiger.

6.not to go to the party yesterday.