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3)  wanted / he had organized

4) didn't know who had attacked

5) was glad that she had found

6) he remembered that he hadn’t rung

7) reached /he had made

8) had left/ he hurried

9) thought /had quarrelled.

10) came / he had returned

11) visited / he had lived

12) entered / had already begun

13) came / told me that she had received

14) Where had you worked before you entered the institute?

15) had examined

16) remembered that I had left

17) were glad /I had passed

18) lay / had left

19) opened / looked around and tried / had happened

20) saw / had travelled