Put these in the past perfect.
1) Julie and Anne...... (not/meet) before the party.
2) I ........(not/have) breakfast when he arrived.
3) He ......(not/use) email before, so I showed him how to use it.
4) You ......(not/study) for the test, so you were very nervous.
5)They .....(not/eat) so we went to a restaurant.