【Passage 1】
Gravity is a force of attraction between two objects with mass.
In human interactions, there are also forces of attraction.
Two people may find each other attractive.
If two people are attracted to each other, they want to be together.
【Passage 2】
In the end, Jessica was glad she went to her reunion.
It was interesting to see how people had changed through the years.
Still, she was happy to get home and appreciate everything that she had.
【Passage 3】
At first she wasn't sure if she could go to the reunion.
One reason was that there wasn't anyone in particular that she wanted to see from her school days.
Another reason was that she was very busy.
She was a working mother, with a boy 8 years old and a husband who was rarely at home.
【Passage 4】
Scientists tell us that what we see in the universe is only a small part of what is there.
The rest is invisible, including dark matter and dark energy.
Evidence for their existence comes from their effects on what we can observe, such as the motion and positions of distant galaxies.
【Passage 5】
Other products followed in rapid succession.
As a result, at the end of 5 years, the company was producing over 100 frozen meals.
Since then they have increased the number of meals to over 150, including pizzas, sandwiches and snacks.
Their foods are carried by natural food stores and supermarkets throughout North America.
【Passage 6】
Dinner was going to be served soon, and some of the classmates were going to give speeches.
Sharon asked Jessica to say a few words too, because people were curious.
This was a surprise. Jessica had never been very popular and she didn't think anyone had noticed her.
She had always felt like an outsider, with only a couple of close friends.
【Passage 7】
Migration takes animals to new, more favorable environments when the seasons change.
Some of these journeys are long and dangerous, along routes with no obvious landmarks.
The longest migration is that of the Arctic tern.
It flies from pole to pole, twice a year.
【Passage 8】
Emma's Best is a small but growing health food company.
It was started in 1995 by a married couple who were tired of working for large companies.
The two founders were Ed and Emma Smith, both health-conscious vegetarians.
Despite the risks, Ed and Emma wanted to start their own business.
【Passage 9】
Betty used to be the most beautiful girl in school.
She wasn't very smart, but she was a great singer.
She made a video of her singing, and it went viral.
She became famous overnight, but it only lasted for about two years.
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