The machine is out of order.

The phrase 'out of order' means broken or not functioning. There is no missing word required in the gap (implied after 'order'?). Wait, the question text seems to lack a gap. Based on options, it likely asks for the meaning or a word to fit? But options are 'new', 'good', 'modern', 'none'. 'The machine is out of order' is a complete sentence. If the question implies 'The machine is [gap] out of order', none fit well. Given the answer 'none', it implies the sentence is correct as is or 'none of the above' descriptors apply.