1. When you visit a web site, some words on the page may be underlined, ___ that there is more information about the subject in another document.
A. showing B. having showed C. showed
2. If ___ with magnetic tapes, magnetic discs can perform both sequential and random processing.
A. comparing B. having compared C. compared
3. You can play computer games through WWW, ___ with partners from other countries and continents.
A. competing B. competed C. having competed
4. ___ the research, the scientists made the analysis of the data obtained.
A. Completing B. Having completed C. Completed
5. The typewriter ___ a few days ago has gone wrong.
A. buying B. having bought C. bought
6. As an electronic memory doesn't have any ___ mechanical parts, it can transfer data at a very high speed.
A. moving B. having moved C. moved
7. When properly ___, computers don't make computational errors.
A. programming B. having programmed C. programmed
8. You will lose some of the formatting when ___ the document in another program.
A. viewing B. having viewed C. viewed
9. Modern computer monitors can display a wide variety of information, ___ text, photographs, computer graphics, video, and animation.
A. including B. having included C. included
10. Most PCs have audio speakers ___ the user to hear sounds, such as music or spoken words that the computer generates.
A. allowing B. having allowed C. allowed
11. ___ all the money, he started looking for work.
A. spending B. having spent C. spent
12. ___ the Mark I computer, the scientists ___ at the Harvard University under the direction of Prof. Aiken used it for ballistic calculations.
A. Developing B. Having developed C. Developed
A. working B. having worked D. worked