1.   Donor blood had to be used during the operation.

2.   Invoice might be, for example, the cost of electricity used during the final quarter of the year.

3.   Lamps used during in-painting are as close to natural sunlight as possible to achieve color correctness and clarity.

4.   The unleavened bread used during the celebration of Passover.

5.   My father has a flat, which he uses during the parliamentary session.

6.   Neuroelectric devices were used during the last century without the blessing of the medical sciences.

7.   One of the main advantages of video as an aid was that it could be used during poor weather.

8.   Over a million gasifier units, usually powering road vehicles, were used during the Second World War.

9.   The achievement of these aims imposed certain restrictions on the methods used during this stage of the field research.

10.   The documents used during the preliminary hearing May not, subject to limited exceptions, be used at the trial.