1.  Airlines struggled to resume normal service over the weekend, businesses began to reopen and the stock markets tested their computers in advance of resumed trading.

2.  Testing a computer is a matter of following the directions.

3.  Then I held my breath and tried to test the computer yet again.

4.  When he had to test eight computers, he placed them around his desk in the middle of the room.

5.  In June, the FAA said it had repaired and tested all computers critical to safe operations.

6.  They are also upgrading and testing computers.