Complete the sentences. Use the past simple or past perfect form of the verbs in brackets.
1 When the police _______________ (arrive), the joyriders _______________ (run) away.
2 The thief _______________ (hide) the jewellery by the time the police _______________ (search) her house.
3 The detective suddenly _______________ (remember) that he _______________ (not question) the shopkeeper’s wife.