1.A plumber ____ fix leaks. A cashier doesn't ____ look after patients.2.A cashier has to give ____ to customers. A cashier doesn't have to give ____ to people. 3.A sports centre manager has to ____ instructions to people. A sports centre manager ____ have to milk cows. 4.A farmer has to ____ crops and ____ cows. A farmer has to ____ up early. A farmer doesn't have to ____ a computer. 5.A scientist has to do ____. A scientist doesn't have to ____ things on a shelf in a warehouse. 6.A nurse has to look ____ patients. A nurse has to ____ at night from time to time. A nurse doesn't have to ____ experiments.

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