Last Tuesday my computer broke while I ____ (try) to finish an important piece of work. So I ____ (call) a friend who knows about computers, and he came over straightaway.
was trying/ called
The next morning when I ___ (try) to leave for work, I discovered that my friend ____ (lock) my front door from outside, and I couldn't get out of the flat.
tried/ had locked
I tried to call my friend, but he ____ (leave) his phone in my flat. It ____ (ring) right next to me.
had left/ was ringing
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