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．What sets human beings apart from animals is not the pursuit of happiness, but the pursuit of meaning, ________ is unique to humans.

One theory, ________ suggested by Harvard University, is that humans began cooking their food, thereby releasing nutrients locked in the raw food and reducing the time needed to chew it.

________ is shown in the report, teenager problems are often connected with family life education.

They told me they had just arrived at the last destination ________ you went to last year.

．Soon children in the camp had many new friends, ________ they shared food, stories, and projects.

________ is often the case with human beings, many animals sleep a lot when young, but sleep much less when they get older.

Jennifer is always absent from school, ________ I suppose is why she is blamed now and then.

The college student lost his life trying to save the drowning child, ________ he will always be remembered.

That man is the richest ________ pleasures are the cheapest.

The Charles Dickens Museum in Doughty Street is the only one of his London homes to survive, ________ he wrote Oliver Twist.