Finish the following dialogue with one word each:
Maher : What do you think is the most important (1)……………… ?
Salma : It is the computer.
Maher : (2).......................... was it invented ?
Salma : About 60 years ago.
Maher : How was it at that time ?
Salma : It was very (3)..............................
Maher : (4)............................ is it today ?
Salma : Oh! It is very small and there are laptops.