Which word in the passage best establishes its tone?

Slipping

Explanation:

The word "slipping" helps to establish the tone of the passage. This word passes the tone of tranquility and quiet, gives the reader a sense of peace and feeling that something good will happen so there is no need for worry and or fear at that moment.

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nautre

nature is sure to be the best thing on earth

the sunshine and beauty is sure to be worth

this can't be sold

for any money or gold

because nature is strongly beautiful and is the best thing to happen on earth