题目内容：

单词和词组（共10小题；每题1分，满分10分）

1.When e_________（暴露）to challenges, we should realize that it is they that make us perfect.

2.To my great d_________（高兴）, we succeeded in working out a plan.

3.Being o_________（乐观）and enthusiastic in our life enables us to go further and further.

4.I apologize for having hurt you but I didn’t do it d_________（故意）.

5.With globalization, it is essential for us to be more t_________（容忍）of different cultures.

6.The rapid increase of private cars _________ _________（导致）the air pollution in cities.

7.Based on different interests, the talk between the two countries held in Beijing _________ _________（破裂）.

8.Although computers are widely used in many fields, they can’t _________ _________ _________（取代）of human beings.

9.We are sure to make progress if we always _________ _________（全神贯注于）what teachers say in class.

10.It will certainly _________ _________ _________（起作用）as long as everyone makes his own contribution to our society.