Об­ра­зуй­те от слова CONTAIN од­но­ко­рен­ное слово так, чтобы оно грам­ма­ти­че­ски и лек­си­че­ски со­от­вет­ство­ва­ло со­дер­жа­нию тек­ста.

The first libraries appeared in around 2600 BC in Sumer. There were no paper books at that time  — people used clay tablets. They were stored in __________________ in special rooms.