During the scientific experiment, Mr. Chen carefully poured the water into the tube, with my classmates _______ beside to see what would happen.
________ no need for everybody to discuss the problem again since it has already been solved.
I didn't like aunt Lucy,who __________ without warning and bringing us presents.
You'd better get all the work _________ before you leave.
At midnight the enemy attacked _________.
They had to_________ before they finished the course because they were not well disciplined.