The Passive Voice

Put the verbs in brackets in the required tense
1. The day before yesterday we____(invite) to the restaurant by Tom Jenkins
2. In Greece the Olympic Games___ (Hold) once in four years
3. The problem____ (study) for there years, but they haven`t got any results
4. This book___( republish) by the end of September
5. John phoned us and asked if our Luggage_____ (already/pack)
6. A new road_____- (build) now around the city
7. The book______(discuss) at the next conference