After Closing Time at the Museum
Most visitors leave a museum when the doors close, but for some employees the working day is far from over. Security staff begin checking every room to make sure (9) ________ is empty. Conservators may use the quiet hours to examine objects that cannot easily be moved while visitors are present. If a display needs changing, technicians can work without having to worry (10) ________ disturbing the public. Large objects sometimes have to be carried through narrow spaces, which can be more difficult (11) ________ it appears. Museums also use the night for cleaning and maintenance. Dust must be removed carefully because some objects are too delicate for (12) ________ ordinary cleaning product to be used on them. Temperature and humidity are monitored throughout the building so (13) ________ staff can react quickly if conditions change. By the time the first visitors arrive, most of this work has already (14) ________ completed. Few people ever see it happening, but the collections would not remain in good condition (15) ________ it. In other words, much of what keeps a museum running takes place out (16) ________ sight.