24.His son has become a doctor,___ has wanted to be.A.who B which

24.His son has become a doctor,___ has wanted to be.A.who B which
25.The question arises as to ____ should go out this morning in the below-zero weather to clean the snow from the entrance.
B.who D.those who
26.Mr.Smith will move into his new house next Mondy,___ it will be completely finished.
A by that time B.by which time C.by then D.by the time
27.To avoid the various foolish opinions ____ mankind is prone,no superhuman genius is required.
A.with which B.of which C.from which D.to which