—Who did you go to Huangshan Mountain with?— No, I didn’t go with ________.  

I don’t think _____ possible to master a foreign language without much memory work and practice.

---Why don't you go to the lecture-room and listen to the talk? 　---I hear there isn't ________in it. 

I think this trip was well worth _____we had paid.

Tod thought he was       when the manager asked him for the advice on the new project.