How long have you __________ the army?
I was just talking to Margot when Jackson _______..
----I didn’t see her yesterday.---- Of course, you ____, because he had gone for a trip..
Using renewable energy sources is a simple idea, but ______ we find it hard to put into practice.
When you come here for your holiday next time, don’t go to ___ hotel; I can find you ____ bed in my flat.
Bob, quickly get this film ____. I want to know if this camera works well.