I'm afraid you've mistaken me ______ my twin sister.
I have reached a point in my life ______ I am supposed to make decisions of my own.
No one responded when Tom was speaking, so he paused _______ before continuing to draw our attention.
Coming into the room, I found them _______ at the table, ________ chess.
______ an important role in a new movie, Andy has got a chance to become famous.
---I’m sorry to have _________ much of your spare time. ---That’s OK, and I am glad to help you.