Choose the best option (A, B or C) to complete each of the following sentences

I. Choose the best option (A, B or C) to complete each of the following sentences.

1.    There is no __________, so everything floats in space.

       A. space station          B. gravity                    C. space suit              

2.    In 2030, __________ will deliver most things in less than half an hour.

       A. smart walls             B. smart screens       C. drones

3. In 20 years from now, I think scientists might be able to print new human body parts using ____.

       A. 3D printers             B. drones                    C. smart homes        

4.    Now we drive petrol cars, but in 2040, all transport __________ electric.

            A. was B. is    C. will be