I can never forget the days _____ we worked together and the days _____ we spent together.A. when; which B. which; when C. what; that D when; when
_______me, he walked up to me, smiling.
--- I regret_______ you John has been fired. --- I can hardly believe my ears. He is such a fine worker.
The message is very important, so it is supposed _______ as soon as possible.
It is strongly suggested that measures _______ students to cheat in exams.
With a lot of difficult problems _______ , the newly-elected president is having a hard time.