Could you, please, correct these sentences? I wrote in the brackets where I'm not sure. 用 英語 (英國) 要怎麼說？

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How can we expect young people to be ready to join (a or zero article?) workforce if universities today are separate from workplaces?
They may invest into (in or into?) building up well-established relationships with a local society, provide a link between universities and the corporate world.
Everyone should have enough money to live, the right to take a (a or zero article?) sick leave or just to have an extra day off, when they are tired.