laughter is strong medicine. It draws people together in ways that trigger healthy physical and emotional changes in the body. Laughter strengthens your immune system, boosts mood, diminishes pain, and protects you from the damaging effects of stress. Nothing works faster or more dependably to bring your mind and body back into balance than a good laugh.Laughter triggers the release of endorphins, the body’s natural feel-good chemicals. Endorphins promote an overall sense of well-being and can even temporarily relieve pain.Laughter protects the heart. Laughter improves the function of blood vessels and increases blood flow, which can help protect you against a heart attack and other cardiovascular problems.
2. Fill in the negative form of the past simple.
1. They invited Linda to their party, but they didn't invite Carol.
2. We met Sally, but we didn't meet Frank.
3. They did their English homework, but they didn't do their math homework.
4. The girls visited the Tower, but they didn't visit Westminster Abbey.
5. He bought jeans, but he didn't buy any T-shirts.
6. She made breakfast, but she didn't make lunch.
7. They were in Boston, but they weren't in New York.
8. She liked Chris, but she didn't like Robert.
9. He was happy, but she wasn't happy.
10.Rosy found a wallet, but she didn't find money in it.
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