Circle the correct words or phrases to complete the following sentences.

1. The most common use for rubber / iron is for producing tyres for cars, motorbikes, bicycles, etc.

2. The most popular material for the construction of buildings and bridges is plastic / steel because it is strong enough to support heavy loads.

3. Today 3D printers / photocopiers allow us to create three-dimensional objects, eg. medical implants, clothes, cars, etc.

4. We use copper / cardboard to make food packaging such as cereal and pasta boxes, as it is food-safe and not harmful to the environment.

5. They use camcorders / portable music players for live-streaming video content such as concerts, live events, and webinars.