选择合适的单词补全对话。

Ben: Dad, will there be a lot of changes in our lives in the future?

Dad: Of course. People will travel to . Maybe they'll live in space. What would you like to see?

Ben: In the future, schools will be under the sea or on high. Students won't schoolbags to go to school any more. They'll learn with students from other countries.

Dad: Great!