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.