7 . Cats bring bad luck. Cats cannot be trusted. This is what I was taught when I was growing up. I ______ cats.

And then I married a woman who was brought up with cats. So it was unavoidable that she would want us to ______ one. My parents-in-law lived with Maggie, a big cat that made me quite ______. When we used to take our baby daughter to their home, I watched Maggie ______. Whenever she went near my daughter, I ran to ensure that Maggie did not ______ her. My wife always laughed and told me Maggie wouldn’t hurt our daughter.

______ from my wife to get a cat became greater after we had two more children. Under pressure, I finally gave in and ______. And then Masala came to our home. Our children loved the new “ ______”. They played with Masala and slept with her. At first, I was a bit ______. I was not sure what would happen next. But slowly I started liking that small animal.

We were happy with life. But then, something ______ happened, and my wife got lung cancer. This terrible time was also when I came to really ______ the cat. Masala provided my wife with good ______ . She stayed by my wife’s bedside around the clock. My wife fought the disease bravely but didn’t ______ at last. After my wife died, Masala also ______ me during my darkest days. Her warm welcome after I came home meant a lot to me. Masala helped me ______my prejudices (偏见) against cats. She really taught me a lesson.

10 . Blowing Up Balloons with CO₂

Chemical reactions (化学反应) make for some great experiments. You can make use of the CO₂(carbon dioxide) given off by a baking soda (小苏打) and lemon juice reaction to blow up your balloon!

What you’ll need:

●Balloon        ●About 40ml of water        ●Soft drink bottle

●Juice from a lemon          ●I teaspoon of baking soda

Instructions:

●Before you begin, make sure that you pull the balloon long to make it as easy as possible to blow up.

●Put the 40ml of water into the soft drink bottle.

●Add the baking soda and mix it with water.

●Put the lemon juice in and quickly put the balloon over the mouth of the bottle.

What’s happening?

If all goes well, then your balloon should inflate! Adding the lemon juice to the baking soda creates a chemical reaction and produces CO₂. The gas rises up and escapes (逸出) through the soft drink bottle. It doesn’t, however, escape the balloon, pushing it outwards and blowing it up.