Research shows that older adults perform better at college than younger adults______that older people tend to have more motivation because they have had to experience life’s difficulties.
One explanation is/One theory is
Traffic accidents tend to happen more often on Fridays than other days. This______end-of-week tiredness and heavy traffic.
may be due to
Sharks do not often eat the humans that they attack.___________that the human body does not provide the high-energy fat that sharks need.
The main reason is/One explanation is/One theory is
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