1.   Clients still have to pay for their vacations, which usually involve the use of unused timeshare units.

2.   Databases One of the earliest uses of computers in history teaching involved the use of database software.

3.   Eye operations often involve the use of highly sophisticated equipment, such as lasers.

4.   For crimes involving the use of guns, the sentences are particularly stiff.

5.   If the desired end of conversion involves the use of inquisitorial means is not the concept of love distorted?

6.   It involves the use of celestial recurrences for the practical purpose of regulating daily activity.

7.   Many searches involve the use of more than one source, and all searches require that the most appropriate source be chosen.

8.   Meanwhile, a different and much more widespread tradition of timekeeping survived involving the use of fire and incense.

9.   Old methods of producing metals such as silver, bronze and iron involved the use of lead.

10.   Recent financial scandals involving the use of tax havens have also led to calls for anti-tax haven legislation.