---It’s good for you to _______ in class.--- I think so. Thank you.
--This is my good friend, ____ name is David. –Nice to meet you.
–Are these his friends? --No, ______.
–_______. What’s this in English? --_______, I don’t know.
In _____room, you can see a lot of things. But some of them are not _____.
Thank you very much _____ your help.