29. We tried to figure out how a.........sweet dessert could also have an underlying bitter taste. (tradition) 30. A number of golden wedding.............took place throughout the locality during the past week. (celebrate) 31. He was asked to........how to connect with the Internet (demonstration) 32. Lan felt sad because she was........in her job(success) 33. All of the books about heroes inspire readers to take.........in order to protect our own neighborhoods and countries. (act) 34. The use of animals in............tests raises difficult ethical questions. (science)