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12.6.9 put the verbs in brackets into the past perfect or the past perfect continuous.

1 how long (you/wait) before the rescue team arrived?
2 the hikers (drink) all their water by the time they reached the village.
3 they (walk) for two hours before the storm started.
4 nagima felt relieved she (survive) such a frightening experience.
5 why weather forecast before you left? (you/not/check) the
6 the rescue team (search) for so many days that they began to lose hope.​