Choose the right answer to fill in the blanks. （看图完成句子。）

A. Thank you. 

B. Good morning.

C. Nice to meet you, too

D. Where are you from?

A: Good morning.

B: 1_________________________.

A: This is my friend, Nancy.

B: Nice to meet you.

C: 2_________________________.

B: 3_________________________?

C: I am from the USA.

B: Welcome to our school!

C: 4_________________________.

地图，图纸，图表在其标题之后或者下方标明密级和保密期限。