It’s generally believed that the_________ of the Dragon Boat Festival is to celebrate the great poet Qu Yuan.
She can’t get down to work because she was deeply _______ by the news of his death.
--- Are you going to attend Jay Chou Concert in Suqian this weekend? --- ______. It’s too good a chance to miss. I’m his die-hard fan.
--- Who ______ it be that is singing in the next room? --- It _______ be Lucy, but I am not sure.
Not until World War II ______ to use new chemical techniques to purify penicillin.
--- What did the manager say at yesterday’s meeting? --- So you______ to him carefully.