| 1 | Other electronic calculators had to be plugged into electricity. | |
| 2 | No wonder people say that computers are taking over the world. | |
| 3 | One of the greatest advances in modern technology has beenthe invention of computers. | |
| 4 | The increase of the numbers of the city would frustrate even the biggest computer. | |
| 5 | Although the problem is intricate and complex, it can be solved very quickly with an electronic computer. |