Complete the text with passive forms of the verbs in brackets: our first glasses 1) (launch) 30 years ago, and for the last 20 years, our production 2) (control) by computers. some of the operations 3) (perform) by robots. this keeps our prices competitive, because unit costs 4) (reduce), as we gain from economies of scale. in the last five years, some of our products 5) (manufacture) in china. we produce a special type of glass, which 6) (design) to have a fire-polished finish and to be distortion-free. at the start of the process, the raw materials such as sand, soda, ash and limestone 7) (weight). then they 8) (blend) and 9) (feed) continuously into melting furnace. recycled glass 10) (also feed) into the furnace in order to reduce waste.
