1.

1). To be obsessed with something2). To be ready with an immediate smart witty reply3). To unable to solve a particularly difficult philosophical problem4). To think wistfully about past life

Answer»

Correct Answer: To be obsessed with something

‘To have something on the BRAIN means ‘to continually THINK about something / not be ABLE to stop thinking about something’.

An EXAMPLE sentence is: ‘Lately, he had nothing but food on the brain’. 



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