D. understood
Stress pattern: understood (Primary stress on the last syllable)

B. cigarette
Stress pattern: cigarette (Primary stress on the last syllable)

D. unexpectedly
Stress pattern: unexpected_ly_ (Primary stress on the third syllable)

C. retain
Stress pattern: retain (Primary stress on the last syllable)

Exercise 2:

A. autobiography
Stress pattern: autobiography (Primary stress on the third syllable)

B. pioneer
Stress pattern: pioneer (Primary stress on the last syllable)

C. responsibility
Stress pattern: re_sponsibility_ (Primary stress on the third syllable)

A. workshop
Stress pattern: workshop (Primary stress on the first syllable)

C. spectacular
Stress pattern: spectacular (Primary stress on the second syllable)

C. corporation
Stress pattern: corporation (Primary stress on the third syllable)

C. extraordinary
Stress pattern: extraordinary (Primary stress on the third syllable)

B. electricity
Stress pattern: electricity (Primary stress on the third syllable)

B. recent
Stress pattern: recent (Primary stress on the first syllable)

A. impressive
Stress pattern: impressive (Primary stress on the second syllable)

Exercise 3:

C. negative
Stress pattern: negative (Primary stress on the first syllable)

A. arctic
Stress pattern: arctic (Primary stress on the first syllable)

D. exact
Stress pattern: exact (Primary stress on the last syllable)

B. mushroom
Stress pattern: mushroom (Primary stress on the first syllable)

D. opportunity
Stress pattern: opportunity (Primary stress on the third syllable)

A. emotionally
Stress pattern: emotionally (Primary stress on the second syllable)

D. terminal
Stress pattern: terminal (Primary stress on the first syllable)

C. activity
Stress pattern: activity (Primary stress on the second syllable)

A. parabolic
Stress pattern: parabolic (Primary stress on the third syllable)

B. region
Stress pattern: region (Primary stress on the first syllable)

A. industry
Stress pattern: industry (Primary stress on the first syllable)

C. interchange
Stress pattern: interchange (Primary stress on the first syllable)

A. negative
Stress pattern: negative (Primary stress on the first syllable)

B. memory
Stress pattern: memory (Primary stress on the first syllable)

C. occasion
Stress pattern: occasion (Primary stress on the second syllable)

B. unemployment
Stress pattern: un_em_ployment (Primary stress on the third syllable)