Remove 'it' from the first sentence and add 'the' before 'floor'. Also, add 'the' to the second sentence.
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JUNHEE LEEBut when we say " step it up a notch",What does "it" stands for?I thought that it is equal to the notch.No; 'it' refers to whatever is being stepped up a notch:
JUNHEE LEEDon't put it in your mouthYou need to phrase it differently.