Complete the dialogue in exercise 3 using the correct tenses.

3.1: was; 3.2: was thinking; 3.3: called; 3.4: Is; 3.5: happened; 3.6: were shopping; 3.7: was looking; 3.8: came; 3.9: showed; 3.10: opened; 3.11: had; 3.12: was; 3.13: didn't expect.