Here, 'walk' is something general and not specific. Indefinite article 'a' will be used as 'walk' begins with consonant sound.
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Q. Fill in the blank:His new job is connected ________ developing software for teaching ?
Q. Change the speech: He said to him, ‘Thank you for your kind help.’
Q. Change the voice: You should open the wine about three hours before you use it.
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