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Ответ:

3 were- had passed

4 lay-had left

5 opened-looked-tried-had happened

6 saw-had travelled

7 came-had returned

8 visited-had lived

9 entered-had begun

10 told-had received

11 had you worked-entered

12 had studied-entered

13 said-had got

14 wanted-had organized

15 didn't know-had attacked

16 was-had found

17 remembered- hadn't rung

18 reached-had made

19 had left-hurried

20 thought-had quarrelled

Объяснение: