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.