1 . We’re presented with more d________ experiences: starting university, getting a job and raising a family.（根据首字母单词拼写）

2 . Look at big smile on the child’s face. Clearly, he is playing to his heart’s c______ in the amusement park. (根据首字母单词拼写)

3 . Within the next 80 years, our lives may be changed b ________ recognition by 3D printing. (根据首字母单词拼写)