Ex. 17 Open the brackets using Active / Passive Voice

A projection keyboard (be) a virtual keyboard that (can project and touch) on any surface. The keyboard (watch) finger movements and (translate) them into keystrokes in the device. Most systems can also (function) as a virtual mouse or even as a virtual piano. A proposed system called the P-ISM will combine the technology with a small video projector to create a portable computer the size of a fountain pen.

An optical virtual keyboard (invent and patent) by IBM engineers in 1992. It optically (detect and analyse) human hand and finger motions and (interpret) them as operations on a physically non-existent input device like a surface having painted or projected keys. In that way it (allow) to emulate unlimited types of manually operated input devices (mouse, keyboard, etc.). All mechanical input units (can / replace) by such virtual devices, optimized for the current application and for the user's physiology maintaining speed, simplicity and unambiguity of manual data input.

In 2002, the start-up company Canesta (develop) a projection keyboard using their proprietary "electronic perception technology". The company subsequently (license) the technology to Celluon of Korea.

Topic 4. Conditional sentences

Ex. 18 Open the brackets using Conditional І.

1. If one of the computers (fail), the whole network (be/affect). 2. If we (remove) a computer from the network, if (not/affect) the other computers. 3. If the main cable (fail), the whole network (fail). 4. The whole network (fail) if the central server (fail). 5. If a cable (break), the whole network (be/affect). 6. If a computer (fail), it (not/affect) the other computers.

Ex. 19 Open the brackets using Conditional 1 or Conditional 2

1. If you (click) on that, that’ll just compact your C drive. 2. If you click on that, that (open) it up and (show) you all your folders. 3. If you (spill) coffee on your keyboard, you could damage it. 4. If there (be) no other folders, you wouldn’t have a little box in there. 5. If you (bring) the cursor down to the very bottom, you (find) the Start button. 6. If you just hit Enter, that (activate) the program. 7. If you don’t virus-check floppies, you (get) a virus. 8. If there was a power cut while you were using your computer, you (may) lose data. 9. If you (install) a faster processor, your computer can process data faster. 10. If you (forget) your password, you would not be able to access your computer. 11. If I (be) you, I would call the technical support line. 12. If you had a virus, it (corrupt) all the files

Ex. 20 Open the brackets using Conditional 1 or Conditional 2

1. If there is power failure, you (may) lose all your data. 2. If you (have) a virus, it may corrupt your files. 3. If you switch on Caps Lock, you (get) all capital letters. 4. If you (not / back up) your files regularly, you (lose) some of them. 5. If you (choose) a simple password, someone would access your files. 6. If you (not / give) your files meaningful names, you may forget what they contain. 7. We wouldn’t be able to compete if we (not / adopt) a better Internet strategy. 8. If you press the delete key, it (delete) the character to the right of the cursor. 9. If you (use) a search engine, you might find information on the Web more quickly. 10. If you double-click on an icon, you (open up) a program or a folder. 11. If you used power-saving options, you (can) cut your electricity bills. 12. If I (be) you, I (learn) programming more hard. 13. If I knew computers as well as you, I (open) my own company,