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.