—Did you have _____ fun in Australia?—Sure. It was _____ unforgettable experience.
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.