Read the energy-audit passage. [1] The audit found that exterior lights remained on after sunrise and that several offices were heated overnight when unoccupied. [2] It also found that laboratory equipment accounted for a large share of necessary nighttime electricity use. [3] The report distinguishes avoidable use from use required for research. [4] _____ the building has clear opportunities to reduce waste, but not all nighttime consumption is unnecessary. [5] _____ managers should first adjust lighting and office schedules rather than impose one uniform shutdown rule. Which pair of transitions best completes the passage?