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Revise the following sentences to make the elements parallel.(修改下列各句,使有关成分保持平行) Leonardo da Vinci was known both as an inventor and painting pictures. shirley has been a waiteress, a tour guide, and taught at school. To swim in the pool is not as much fun as swimming in a river. Doctors advise brushing your teeth after every meal and to avoid sugar in your diet. We asked the store manager to show us a gift that was inexpensive, useful and looked nice.