1 . The a______ of the three numbers 7, 12 and 20 is 13, because the total of 7, 12 and 20 is 39, and 39 divided by 3 is 13. (根据首字母单词拼写)

2 . On the card for Laura, I wrote a note stressing some of her q______ I admired, such as her ambitious spirit, creativity, and strong inner drive. (根据首字母单词拼写)

3 . Drip irrigation (滴灌), an effective way of water c_________________ made by Israel, sets an example for countries and regions who also lack water. (根据首字母单词拼写)

4 . Nowadays, the Internet can allow us to step into a world without f______ where you can explore limitless possibilities and try new things. (根据首字母单词拼写)

5 . The BRIC (金砖) countries are the biggest centers of economic growth and more than half of the planet’s population, whose role in international a______ will grow. (根据首字母单词拼写)

6 . Carbon dioxide makes up the vast m______ of greenhouse gas emissions, so it’s necessary to protect forests to fix carbon. (根据首字母单词拼写)

7 . Many dedicated volunteers make c___________ to the community by organizing events and offering their time and skills for the betterment of society. (根据首字母单词拼写)

8 . Through heartfelt apologies and genuine acts of kindness, he eventually won the f___________ of his best friend who had been very angry with him. (根据首字母单词拼写)

9 . Increased muscle _______ help support better posture and even improve daily activities like walking upstairs or carrying heavy things. (根据句意填空)

10 . Some kinds of b______ (电池) can be recharged by connecting them to a source of direct current. (根据中英文提示填空)