----It’s a long time since I saw Kevin. What has happened to him?----Well, to tell you the truth, he _______ for nearly a month.
Lucy was chosen for the job because she was superior ________the other candidates.
Not until all the fish died in the river ________ how serious the pollution was.
His first book ______ last month is based on a true story.
________by curiosity,he opened his wife’s notebook and began reading her diary.
________ the delayed flight will take off depends much on the weather.