After you listen, complete the sentences by dragging the option into the space.
1. If Robert Noyce hadn’t invented the microchip, we wouldn’t have had .
2. If Henry Ford hadn’t invented the production line, wouldn’t have been available to ordinary people.
3. If we hadn’t invented the , mass tourism wouldn’t have existed.
4. If James Watt hadn’t invented the steam engine, the wouldn’t have taken place.