Choose the best words to complete these sentences

1. In the first house shown in the video, the shower water is heated by _____ .
1. electricity
2. wind energy
3. solar energy
2. These houses are _____ homes .
1. experimental
2. for sale
3. real people’s
3. The technology in these houses helps them make more efficient use of _____ compared to ordinary houses.
1. energy
2. water
3. space
4. There’s a _____ to open the door.
1. scanner
2. fingerprint scanner
3. retina scanner
5. When it’s hot, the _____ close automatically.
1. windows
2. curtains
3. shutters
6. The chair also contains _____ .
1. books
2. food and drink
3. toys