16.What can we learn from the conversation?
A.The wallet has a place to put pictures.
B.The girl has 20 dollars on her.
C.The tie costs the girl 15 dollars.
听第10段材料,回答第17至20题。
17.When is the program held?
A.In summer.
B.In autumn.
C.In winter.
18.How long does the program last?
A.About one month.
B.About two months.
C.About three months.