Read the text and choose the best answers.
In Vietnam, Mid-Autumn Festival is a great celebration for children. It ( 17 )__________ on the 15th of the eighth lunar month, ( 18 ) __________ preparation starts a few weeks before that: teenagers ( 19 )__________ to make beautiful lanterns. On the day, adults prepare fruits and cakes ( 20 )__________ children. The ( 21 )__________ part of the celebration is in the evening. Children walk around their neighborhood with their lanterns before enjoying the food together.
21.
A.
least
B.
most
C.
all
D.
best