It was in the lab ______ was taken charge of by Pro. Harris ______ they did the experiment.
He _____ tasted the mixture and give a smile.
None of the students watched the teacher______.
Miss Yang will teach us Chinese today ____ Mr Zhang.
Johnny, you ________ play with the knife, you ________ hurt yourself.
—I’ve studied growing plants as one of my interests. Could I make some suggestions? —__________.