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Three.

They cost too much./They are too expensive.

I like flying cars best. Because it will be easier for me to travel around if I have such a car./ I like

the 3-D printer best. Because I can print my favourite toys with it./ I like the robot suit best.

Because I can help my grandparents with their farmwork with it.

The public transport system is very comfortable and safe. People drive shared-cars which float in

the air and this saves lots of space.

We all shop online on Mars with our computers and phones. And the robots will help send the goods

to our houses.

We don't need to go to school. Every student has a computer at home connected to an interplanetary

network. It is much more relaxing and interesting for the students to learn.

And we also have more free time now with the help of technology. We can pay more attention to

the things we are really interested in.