Fill the parentheses with T (True) or F (False). In reference to eraser and delete keys one can say that

Fill the parentheses with T (True) or F (False).
In reference to eraser and delete keys one can say that

( ) their utility is important only to scientists.

( ) those machines have nothing to do with papers and researches.

( ) those high-tech electronic inventions allow us to erasemistakes, so that we can remake texts again and again.

The correct sequence, from top to bottom, is