1 . We can’t achieve anything unless we __________ __________ __________ (投身于，热衷于) it. （根据汉语提示完成句子）

2 . When we are in low spirits, we may __________ __________ __________ (迫切需要) things that give us comfort and sense of security.（根据汉语提示完成句子）

3 . We think critically, ______ ______ ______ (而，相对于) just copying from books. (根据汉语提示完成句子)

4 . Over the past three ______ (十年), the company has made some efforts to improve the quality of its product. （根据汉语提示完成句子）

6 . ________________ (从我的角度、观点出发), social development brings lots of pollution. （根据汉语提示补全句子）

7 . ________________ (最后但同样重要的), I wish every one of you a bright future. （根据汉语提示补全句子）

8 . The advantages of Layer 2 switches ________________ (在于) speed and cost.（根据汉语提示补全句子）

9 . These troubles came along all at the same time that I was ________ (不知所措). （根据汉语提示单词拼写）

10 . I need to have a chance to get my head together and ________ (充分考虑，想透) everything. (根据汉语提示单词拼写)