4. Compete the text with the passive form of the verbs in brackets.

Right now in cities around the world ordinary streets and pavements are transformed into fantastical scenes such as sharks bursting from the cement or giant cracks splitting the earth apart. These are the creations of 3-D street artists. The 3-dimensional effects of these images are so realistic that viewers feel like they are transported inside the scene. These amazing scenes are drawn first with chalk and then they are painted with acrylic paint. 3-D street artists, such as Edgar Mueller, work many days to create these temporary artworks. Mueller's work "Shark Attack" is created on a street in Hong Kong. Viewers are amazed by the image's realistic effect and often avoided stepping on it. Sometimes Mueller is inspired suddenly and will just start creating a scene in a street. You just never know when the next street is covered with a scene from Mueller's imagination!