III. Complete the sentences with a suitable word. The first letter is given.
1. A s____________ is a very tall building in a city.
2. In the future r____________ will take care of children, and do housework.
3. U____________ are believed to be spacecrafts from another planet.
4. A w____________ TV won’t need any wires or cables.
5. S____________ energy is power or heat that comes from the sun.
6. My future house will be on the o___________. It will be surrounded by islands and blue sea.
7. In the future, there will be more s___________ travel to send people to Mars or to the Moon.
8. You can s____________ the Internet on a smart TV.