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New Scientist contains informative articles about recent scientific breakthroughs, a comprehensive listing of job advertisements, and (138) ___ of new technological products on the market.
This is a (139) ___ that you can expect the elevators to occasionally be out of service while the work is underway.
Elevator service to the building’s many floors (140) ___ from day to day.
(141) ____you work on a lower floor, please take the stairs to reach your floor instead of using the elevators.
(142) ___.