【单选题】'How was ______they discovered the entrance to the underground palace?' Totally by chance
【判断题】They discovered the died whale when they were descending in the submerisbles.
【简答题】今年“教师节”是星期一,明年“教师节”是星期______.
【单选题】It was not midnight that they discovered the children were not in their beds.
【单选题】—How was ______ they discovered the entrance to the underground palace? —Totally by chance.