Sure, let's analyze the stress patterns of the given words:

**Question 3: Choose the word that has a different stressed syllable from the rest.**

A. comment (stress on the first syllable: COM-ment)
B. building (stress on the first syllable: BUILD-ing)
C. model (stress on the first syllable: MOD-el)
D. complete (stress on the second syllable: com-PLETE)

The word with a different stressed syllable is **D. complete**.

**Question 4: Choose the word whose primary stress is placed on the second syllable.**

A. equipment (stress on the second syllable: e-QUIP-ment)
B. dangerous (stress on the first syllable: DAN-ger-ous)
C. surfboard (stress on the first syllable: SURF-board)
D. interesting (stress on the first syllable: IN-ter-est-ing)

The word with the primary stress on the second syllable is **A. equipment**.