One proposal______ that an observatory built on the other side of the moon will be good for astronomic observation, as there is no atmosphere around the moon.
【简答题】听短文,补填所缺内容。 It's 9:00. It's Tuesday 1. . Jack and his family are 2. home. Jack's mother is sitting by the window. His sister is doing 3._____ homework. Jack is a little boy. But he is very strong. Lo...