Вставить who,whom,whose, which,that

8 who
9 who
10 who
11 that
12 whose
13 whose
14 that
15 who
16 that
17 who
18 which
19 whom
20 that
21 which
22 which
23 which
24 whose
25 whom
Между that и which большой разницы нет. Which считается чуть более официальным.