Polluted, underwater cities, moon shuttle, robotic housemaid, online schools, glass dome
1. A
travels into space.
2. You can't swim in this lake because it is
3. I think that people will live in
in the future.
4. My friend wants to have a
because he
doesn't like to do the housework.
5. They built a new house with a
in it.
6. Students will study at
..in the future.