Fill in the correct form of the verb in Passive Voice:
1.The keys __(loose) by Bob yesterday.
2. The cheap flights__(recommend) in summer.
3. A new shoe shop__(build) next year.
4. Many parties__(held) in this large hall.
5. The University of Oxford__(found) in 1214.
6. The first women's college in Cambidge__(open) in 1871.
7. Almost all colleges__(mix) nowadays.
8. A year__(divide) into three terms.
9. His lectures__(attend) by many students every year.

1 were lost 2 are recommended 3 will be built 4 are hold 5 was founded 6 was opened 7 are mixed 8 is divided 9 are attended