The company began____the medicine in powder form to physicians to use with patients.
A.distributing B.contributing C.separating D.displaying
This article will____two drugs that started revolutions in medicine.
A.carry on B.fix on C.focus on D.rely on
The telephone is very____for communication.
A.intelligent B.obedient C.patient D.convenient
They also make TV____to people who live far away from cities.
A.separable B.flexible C.accessible D.sensible
Modern TVs use many of the ________ first discovered by Farnsworth.
A.principles B.principals C.probabilities D.prohibitions
Many different people ________ the development of TV.
A.led to B.contributed to C.stuck to D.are addicted to
