Medical education and engineering education belong to totally different categories and are always on ________ tracks, it is difficult to develop cross-subjects between them.

The window is dirty—I know It ______ for ages and I’m consideringgiving the task to our children

her did buy the CD, ________ he actually doesn’t appreciate the music in it at all.

end of this year, 160 newstudents ___ in the English Department of this world famous university

She is_______, so her students are afraid to talk with her .