单项选择题
____too much to do, they have to keep themselves busy all day long.
单项选择题 The fried fish we ate at the restaurant yesterday is delicious. I’d like to have it again even if it costs____.
单项选择题 what is the main idea of the passage（）
单项选择题 ____ from space, our earth, with water covering 70% of its surface, appears as a "blue planet".
