Complete the story. Use the past perfect or a past simple of the verbs in brackets.

I was (be) at a friend's party on Saturday when something really funny (happen). When I (arrive), the party (not start) yet and my friend was in the kitchen preparing the food. He (introduce) me to a woman I (not know). But when we (start) talking, we realized that we (meet) before. We (compare) things we (do) in the past, but couldn't find a connection. Then I (remember). She (be) my sister's pen friend and she (come) to stay with us for a week one summer.