Teacher: Hurry up, everyone!
Laura: Don't push, Jamie!
Rosie: Look! There's the London Eye. How high is it?
Laura: I think it's about 135 metres high. I went on it last year. There's a brilliant view from the top.
Rosie: How far can you see?
Teacher: You can see for twenty-five miles on a fine day.
Rosie: Wow!
Laura: How deep is the river, sir?
Teacher: It depends. Here it's about six or seven metres deep.
Jamin: Sir, how long ...?
Teacher: ... is the River Thames? It's 251 miles long.
Jamin: No, sir. I mean how long is the boat trip? I'm hungry!