Take up - Start doing a new activity, Go over - Check something carefully, Read up on - Study something by reading a lot about it, Drop out - Leave school without finishing your studies, Copy out - Write something again exactly as it was written, Look up - to become better/ to find a piece of information on internet, book, etc., Mix up - To confuse things or people, Look at - to read something quickly and not very thoroughly, Keep up with - To stay at the same level as others, Sign up - to agree to take part in an activity or to join an organization,

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