1 . It was all over in the b_________ of an eye. (根据首字母单词拼写)

2 . Doing sports is b________to our health physically and mentally.

3 . As is known to us all, taking exercise is b______ to our health.

4 . When passing by the house, he had his leg b________ by a big dog. (根据首字母单词拼写)

5 . The four countries that b________ to the United Kingdom work together in some areas. They use the same flag, known as the Union Jack, as well as share the same currency and military defence. (根据首字母单词拼写)

6 . Many people hold a strong b______ that the cure for cancer will be found one day. (根据首字母单词拼写)

7 . But the copy he gave him had not been written out in full as usual. It was simply a b________ sheet of paper. (根据首字母单词拼写)

8 . B______ deep down in the earth for thousands of years, the dead forest has rotted away and become coal. (根据首字母单词拼写)

9 . As a student, it’s important to find a b________ between studying and relaxing to maintain a healthy lifestyle. (根据首字母单词拼写)

10 . Watching Tibetan antelopes move slowly across the green grass, I'm struck by their b___________. (根据首字母单词拼写)