How many students visited the Great Wall?

M: I hear some students in your class visited the Great Wall.
W: You are right.
M: How many students went there?
W: Only half a dozen.

W: Excuse me, can you tell me how to get to the zoo?
M: You can take a No. 111 Bus.
W: Where shall I get off the bus?
M: At the railway station. The zoo is to the east of it. It’s not very far, you can’t miss it.
W: Thank you.