OE


C, E The phrase “collided with” serves as a detour road sign in this sentence. The “promise” that mobile communication is supposed to improve “peace of mind” contrasts with the fact that it allows the professionals’ supervisors to reach them when they are trying to spend time with their families. Thus, the word in the blank should contrast with “peace of mind.” “Stress” or “anxiety” would be fine predictions. (C) perturbation, which means “agitation,” and (E) vexation, which means “frustration,” are great matches and are correct. (B) serenity and (F) tranquility both mean “calmness” and are the opposite of what is needed. Be careful: you might think that the ability to be reached by superiors at any time would lead to (A) flexibility or (D) productivity, but neither of these contrasts with the promised “peace of mind.”