Activity 2. Use the correct preposition from the list below. of, into, to, by, over, on

The evolution (1)
electronic computers (2)a period (3)time
can be traced effectively (4)
dividing this period (5)
various generations. Each
generation is characterized (6)
a major technological development that fundamentally changed
the way computers operated. These helped to develop smaller, cheaper, powerful, efficient and reliable devices.
Now you could read about each generation and the developments that led (7)...
the current devices
that we use today. Classification (8)... the electronic computers may be based (9)
either their principles (10)
operation or their configuration. By configuration, we mean the size,
speed (11)
doing computation and storage capacity (12)
a computer.