The key to exercise solutions in chapter 7.2 - Hands up for the textbook New Total English Pre-Intermediate - Students' Book with authors Araminta Crace and Richard Acklam from Pearson Education
Question
Listen to the adjectives from exercise 2 and underline the stressed syllables.
Now look at the unstressed syllables. Which unstressed syllables are pronounced with a schwa /ə/? Listen again, check and repeat.