Read the passage and answer the question below.

Wedding custom in Viet Nam is quite complicated. Before an official wedding, a ceremony of engagement must be held first. In Vietnamese tradition, an engagement ceremony is an official occasion for families of fiancé and fiancee to mark their relationship and to arrange the wedding.

Each family needs to prepare a representative who is a family member having a happy life and a high-ranking position in the family. On the day of the engagement, the representatives of the two families will have some announcements about the wedding and exchange gifts. The time of the wedding is chosen suitably based on the lunar calendar. Gifts which are put in trays are prepared by the family of fiance a few days before the engagement ceremony. The number of trays must be an odd number. In Vietnamese habits, odd numbers are thought to bring luck to the couple. In the trays, there are betel leaves, areca nut fruits, wine, tea, husband wife, and sticky rice. On the wedding day, the couple has to stay apart to avoid unlucky things. The wedding ceremony starts in front of the ancestor altar. The master of the wedding ceremony will declare the couple becomes a new family.

1. What ceremony occurs before the official wedding?

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2. Who is selected to be the representative of each family?

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3. Who prepares gift trays for the engagement ceremony?

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4. Why must the number of trays be an odd number?

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5. Where does the wedding ceremony occur?