Read the following paragraph and complete it with one suitable word

Tet is celebrated on the first day (1) ............. the Lunar New Year. Some weeks before the New Year, the Vietnamese (2) ........... their houses and paint the walls. New clothes are bought (3) .......... the occasion. One or two days (4) ............. the festival, people make chung cake, (5) ........... is the traditional cake. (6) ........... the New Year’s Eve, the whole family gets together for a dinner. On the New Year morning, all the (7) ............ of the family respect to the elders by beautiful words. In return, they (8) ........... lucky money (9) ............ in red tiny envelopes. Then people go to (10) .......... their neighbours, friends and relatives.

(1) .............

• A. 
  in
• B. 
  of
• C. 
  on
• D. 
  at