1. A. enjoyable
2. B. made
3. C. part
4. D. before
5. B. because

So the completed passage reads:

I have a very interesting and (1) enjoyable hobby. I make short video clips with my digital camera. It was my birthday present from my parents last year. Since then, I have (2) made three short films. It's great fun! I started asking my friends and relatives to take (3) part in the films. I have tried to write the story for my video clips. When I have finished the script, I make copies for the "actors". Each scene is small and they can look at the words just (4) before we start filming. We film at the weekend in my neighborhood, (5) because no one has to travel far. When the video clip is finished, I invite all the "actors" and we watch the film at my house.