Раскрыть скобки,поставить глаголы в нужную форму страдательного залога.
1 Those books (return) to the library yesterday.
2 the paintings (exhibit) till the end of the month.
5 this room (use) only on special occasions.
10 the book (return) to the library yesterday.
11 thousands of new houses (build) every year

1 Those books were returned to the library yesterday.2 the paintings will be exhibited till the end of the month.5 this room is used only on special occasions.10 the book was returned to the library yesterday.11 thousands of new houses are built every year