1. Hello! I (try) .......... to telephone you all week. Where you (be) .......?
2. I don't think we (meet) ....... before. - Well, I (see) ........ you once at a party, but we (not be) .......... introduced them.
3. I (buy) .......... the book, but when I (hear) ........... the opinion of cristics, I (change) .......... my mind.