68 D varies

　　69 C in control

　　70 B possess

　　71 D vast

　　72 A but

　　73 B essential

　　74 C in touch with

　　75 A acquire

　　76 B profession

　　77 D only

　　78 A with

　　79 C encourage

　　80 C interests

　　81 A broaden

　　82 A amid

　　83 D sake

　　84 B make

　　85 A field

　　86 C meaningful

　　87 can be applied to the development of the new technology

　　88 must be wrong

　　89 whatever it could be

　　90 Compared with the place where I grew up

　　91 Until he accomplished his mission