91. Our research has focused on a drug which is so ______ as to be able to change brain chemistry.

A. powerful

B. influential

C. monstrous

D. vigorous

92. People have no trust _____ his words.

A. on

B. to

C. with

D. in

93. People who refuse to _____ with the law will be punished.

A. obey

B. consent

C. conceal

D. comply

94. People who want progress are hospitable _____ new ideas.

A. towards

B. from

C. to

D. at

95. Physics is the present-day equivalent of _____ used to be called natural philosophy, from which most of present-day science arose.

A. that

B. all

C. which

D. what