单词和词组（共10小题；每题1分，满分10分）

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

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

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

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

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

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

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

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

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

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