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 belived 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 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