Classify the past simple endings for each verb.

The exercise asks to classify each verb in the sentences based on the pronunciation of the past simple ending: /t/, /d/, or /ɪd/. Here's the classification: 1. studied /d/, 2. decided /ɪd/, 3. watched /t/, 4. danced /t/, 5. called /d/, 6. waited /ɪd/, 7. phoned /d/, 8. walked /t/, 9. arrived /d/. This classification reflects the phonetic pattern of past tense endings in English.