All students should be told about the rules for the test, His car has to be cleaned before the event, A lot of questions must be answered by the pupils, The police should be called after the accident, Whales must be saved from extinction., The entire valley can be seen from their mountain, A child shouldn't be given everything he or she wants, The Mona Lisa can be seen in the Louvre, Employees must be paid on the last day of the month, The earthquake could be felt 20 km away,

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