You ------- throw trash in the sea., have to, must, mustn´t, You -------- take care of the water., shouldn´t, should, mustn´t, We ------- recycle., don´t have to, mustn´t, have to, We ------- protect the environment., shouldn´t, don´t have to, should, You ------- light a fire., have to, should, mustn´t, You -------- keep lights on., shouldn't, must, don´t have to, You ------- close the faucet., mustn´t, shouldn´t, must, We ------ respect our parents., mustn't, don't have to, must, Kids ----- do homework., don't have to, shouldn't, have to, You ------ park your car here., have to, mustn't, shouldn't

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