COMPLETE THE SENTENCES WITH THE PAST PERFECT SIMPLE OR PAST PERFECT CONTINUOUS FORM OF THE VERBS IN BRACKETS.

1)
a. Charles and Kitty ................. (live) together for twenty years when they finally got married.
b. Charles and Kitty ................. (know) each other for most of their lives when they finally got married.

2)
a. Vladimir ................. (sneak) out of the house at night for months before be was finally caught.
b. Earlier that night, Vladimir ................. (sneak) out of the house without waking his parents.

3)
a. Before he was forced to resign, the minister ................. (receive) illegal gifts on several occasions.
b. Before he was finally caught, the minister ................. (receive) illegal gifts for more than a year.

4)
a. The security guard ................. (sleep) for hours when the office wasz broken into.
b. The security guard was fired because he ................. (sleep) through the burglary.