We’ll never give up working on the experiment (实验), ______ difficult it is.

After months of hard work, the building was completed ahead of ______.

_ impressed me was the well-known young author, Guo Jingming’samazing try of directing a movie Tiny Times, which was based on one of hisbestseller novels

This bag isn’t mine. It’s ______. nobody else B

One of my teachers ____ anEnglishman.