1 . The use of paper bags is of great b________ to the environment. （根据首字母单词拼写）

2 . The air was so thin that we could hardly b________.（根据首字母单词拼写）

3 . The thin ice on the lake hardly b________your weight. Take care!

4 . The little hero was praised for his b____________(勇敢) in the accident.

5 . It is my b____________(信念) that we will succeed one day.

6 . We can b_____________(受益) from reading books.

7 . If he wants to be better in health, he should have a b___________(平衡的) diet.

8 . The western holiday Halloween also had its origin in old __________ (信仰，信心) about the return of the spirits of dead people. (根据汉语提示单词拼写)

9 . What should you do if you are being __________ (叮咬) by mosquitoes? (根据汉语提示单词拼写)

10 . English is a _____(分支) of Germanic family of languages.