The first.
Boundary is stressed on the first syllable.
Yes, the second syllable in "boundary" is stressed. The stress falls on the "dar" syllable.
The stressed syllable is the the first syllable of the word. BOUN-da-ry
The stressed syllable in the word "boundary" is "bound."
Yes.
Footprint is stressed on the first syllable.
The second syllable (-ta-) is the stressed syllable in potato.
The stressed syllable of "satisfactory" is the third syllable, which is "fac."
Lightning is stressed on the first syllable.
The stressed syllable in the word "contentment" is the second syllable, "tent."
The stressed syllable in "believe" is the second syllable - "lieve."
Tomorrow has one stressed syllable. It is stressed on the second syllable.