Read the text and choose the correct answer to each question.

Every year, in the second lunar month, the weather starts to be shiny and warm after spring rains; ban flowers bloom white all over the southwest mountainous region, promising a productive crops on fields and gardens. Ban flower festival opens when rice grows under spring rains, being lightly green on wet rice fields.
Ban flower festival (also known as Sen ban or Sen muong festival) is held to pray for rain, happiness for villages of the Thai ethnic group. From the early morning of the festival day, people can hear the sounds of drums and gongs. The kitchens of stilt houses are busy: people steam sticky rice, boil chicken, and slice bamboo shoots. There are many jars of pipe wine (rượu cần) for guests. Girls and boys wearing beautiful clothes call each other to come to the forests where there are many ban flowers blooming. They select the most beautiful flower branches to give their lovers and parents.
Ban flower festival lasts three days. For girls and boys in the village, the last festival night is the most joyful. In the charming scenery of mountainous region, the charm-exchange (giao duyên) singing contest and the sounds of pan-pipe (khèn), flute last until midnight. From the festival, many love stories are formed and many couples get married. Due to this, the last night is also the most memorable one.