Question

Помогите решить упражнение

Answer 1

16) had gone;
17) had studied; 
18) had booked;
19) found;
20) kept;
21) hadn't spent;
22) had listened;
23) hadn't resigned;
24) stopped; 
25) had studied;
26) stopped;
27) hadn't gained;
28) had finished;
29) had.