1. For the [demand, variety, profit, security] of passengers, all hand baggage is carefully checked at the airport.
2. The process of removing the bugs from a computer program is called [attempt, debugging, completing, estimating].
3. The program was [protected, simplified, demanded, supported] so that the inexperienced user could master it.
4. This is a [compatible, secure, profitable, complete] list of educational publishers in Britain.
5. According to Sun Microsystems' [demand, estimation, offer, attempt], there are more than 700 000 developers using Java technology today.
6. An input device [attempts, demands, provides, keeps track] communication between the computer and the user.
7. The majority of users are attracted to Microsoft Windows by its [response, resolution, compatibility, simplicity].
8. In theory, these machines should [advance, last, complete, support] for 10 years or more.
9. A [mode, profit, folder, plug] is a small plastic object with two or three metal pins that connects an electrical device to the source of electric energy.