71. Vietnam’s New Year / be celebrate / according to / the Lunar calendar.
-> Vietnam's New Year is celebrated according to the Lunar calendar.
72. It / be / know / as Tet Nguyen Dan, or Tet.
-> It is known as Tet Nguyen Dan, or Tet.
73. It / begin / between / January 21st / February 19th.
-> It begins between January 21st and February 19th.
74. The exact date / change / from year to year.
-> The exact date changes from year to year.
75. Vietnamese people / usually / prepare / holiday / several weeks beforehand.
-> Vietnamese people usually prepare for the holiday several weeks beforehand.
76. They / tidy / houses / cook / special food / clean and make offerings on the family altars.
-> They tidy their houses, cook special food, clean and make offerings on the family altars.
77. On the New Year’s Eve / people / sit up to / midnight / see the New Year / in.
-> On the New Years's Eve, people sit up to midnight to see the New Year in.
78. Then / put on / new clothes / and / give / one another / greetings.
-> Then they put on new clothes and give one another greetings.
79. Vietnamese people / believe / how / people / act / during Tet holiday / influence / whole year.
-> Vietnamese people believe (that) how people act during Tet holiday will influence the whole year.
80. As a result / they / try / avoid / arguments / and / smile / as much / possible.
-> As a result, they try to avoid arguments and smile as much as possible.