Answer:
The boys swore that the books were theirs.
Explanation:
The idea that "theirs" needs an apostrophe, comes out of the fact that on virtually every other word, 's indicates possession, so English speakers sometimes think theirs should be spelled their's. However, this is always incorrect – <em>theirs is the only correct spelling</em>.
The need for more soldiers to go to war and women to work, which meant more reproduction among males and females. And parents wanted their lineage to carry on throughout the years. The Baby Boomers
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