What class did you have this afternoon, Kate?
A chemistry class. We've got a new chemistry teacher this term.
Who is it?
James Black. He told us to call Jim, not to call him Mr. Black.
Oh, James Black. I know him. He's a little thin man who smiles a lot.
Yes, but many of us are afraid of him.
Really? But I hear he's a very good teacher.
Yes, he is. His classes are always lively and interesting. And we all watch and listen to him very carefully in his class.
It's important to watch carefully when you're studying chemistry, I think.
Jim often says that too, So we are never allowed to do anything without watching.