They (install) new software while the system was running., had been installing, had installed, were installing, installed, We (test) the device before it was sold to consumers., had been testing, tested, had tested, were testing, I (talk) on the phone when the connection was lost., was talking, talked, had been talking, had talked, The company (launch) a new digital service last year., launched, was launched, had launched, had been launching, He (use) the same handset for five years before he replaced it., had been using, used, was using, had used, I (check) all my messages before the meeting started., checked, had checked, was checking, had been checking, They (work) on the project for months before it was completed., had been working, worked, were working, had worked, Yesterday I (download) a new app on my smartphone., had downloaded, downloaded, had been downloading, was downloaded.

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