11.   It can used with waterproofing wax and polish for extra protection.

12.   It is for the security force commanders to ensure that all the resources available to them are used with the maximum effectiveness.

13.   It should always be used with definite intention - never mechanically added to the ensemble without consciously imagining its effect.

14.   Languages vary tremendously in the type of conjunctions they prefer to use as well as the frequency with which they use such items.

15.   Learners like hand-outs, but they should not be used with monotonous regularity to echo everything the teacher says.

16.   No more than a few hundred of these are used with any frequency.

17.   One of the most innovative systems is that found in the optical mouse used with the Xerox Star business computer.

18.   Other semi-thin paints have similar properties when used with the airbrush.

19.   Partly of course in printed works, but these must be used with infinite caution and constant checking.

20.   People must buy either a new digital television or a converter box to use with their old set.