34.In the meantime,the question facing business is whether s

34.In the meantime,the question facing business is whether such
research is ________ the costs.
A.worth B.worth of C.worthy D.worthwhile
35.________ does he know that the police are about to arrest him.
A.Few B.Only C.Seldom D.Little
36.He asked his sister to look after his children ________ his
death.
A.in the event of B.in view of
C.on account of D.on the edge of
请问选择哪个?请讲讲为什么.