13)paid
14)had already begun
15)was filling in
16)did на самом деле я бы поставил was
17)got went put decided
18)had been travelling
19)had completed
20)spent
21)were you doing
22)did you exchanged
23)had come knew
24)had been know( know не употребляется в continues)
25)had been driving
26)had entered found had understood happened
27)was reading
28)had been know corresponding
29)fell had risen
30)disappeared were having