call on - to ask someone in a formal way to do something: They will ..... all men and boys over the age of 14 to join the army., catch on - to become fashionable or popular: I wonder if the game will ever ...... with young people?, come on - to start to happen or work: The heating will ..... at six in the morning., draw on - to use information or your knowledge of something to help you do something: She had a wealth of experience to...., move on - to start to discuss a new subject during a formal meeting: Before I ...., does anyone have any questions they would like to ask?, run on - If a machine runs on a particular type or supply of power, it uses that power to work: Some calculators .... solar power., stay on - to continue to be in a place, job, or school after the other people who were with you have left: Gill decided to .... at university to do further research., take on - to accept a particular job or responsibility: She used to .... too much .... and made herself ill.,

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