Из пассивного залога сделать активный 1. Many shapes had to be

Из пассивного заклада сделать активный 1. Many shapes had to be manufactured at a relatively high cost. 2. Different kinds of steel will have to be used in making blades. 3. High carbon steel may be hardened by heating it to a certain temperature and then quickly cooling in water. 4. Vanadium steel can be used for springs. 5. Larger drills could be used in that machine.