In many classrooms today,...
Before the automobile,...
people didn't travel as much from city to city.
Sometime in the near future,...
In the next 100 years,...
people work more than 40 hours a week.
Before there were supermarkets,...
In most offices these days,...
doctors might find a cure for the common cold.
many TV shows were in black and white.
people used to shop at small grocery stores.
pollution is becoming a serious problem.
students are learning with interactive whiteboards.
In many cities nowadays,...
there will probably be cities in space.
About 60 years ago,...
