complete the sentences with the past simple, the past perfect simple or the past perfect continuous of the verbs in brackets

1. by the time we (reach) the park,
it (already/start) raining.

2. Joe (study) all afternoon and was glad when
Glen (call) him

3. When I (arrive) at the airport, my sister's flight
(not land) yet.

4. the children (be) exhausted because they
(play) on the beach for hours.

5. the explores (find) the treasure after they (search) for it for one three days.​