单词和词组。

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.