Complete the text with the passive form of the verbs

Watch Your Step!

Right now in cities around the world ordinary streets and pavements [are being transformed|are transformed|were 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|were transported|are being transported] inside the scene. These amazing scenes [are drawn|are being drawn|were drawn] first with chalk and then they [are being painted|were painted|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|was created|will be created] on a street in Hong Kong. Viewers [were amazed|are amazed|are being amazed] by the image's realistic effect and often avoided stepping on it. Sometimes Mueller [was inspired|is being inspired|is inspired] suddenly and will just start creating a scene in a street. You just never know when the next street [is covered|will be covered|was covered] with a scene from Mueller's imagination!