Change the phrases into passive voice: 1) to produce hightech equipment - 2) to develop new products - 3) to process raw materials - 4) to stock the shelves - 5) to plan the work schedule - 6) to determine the sequence of operations - 7) to serve customers - 8) to paint the walls - 9) to assemble the cars - 10) to build the plant - 11) to cut hair - 12) to make furniture -