1.Which is （B nearer ）to the earth,the moon or the sun?
月球和太阳哪一个离地球更近?
两者作比较,用比较级.
2.Of these children ,Danny is (the thinnest).
丹尼是这些孩子当中最瘦的.
of短语是比较的范围,用最高级.孩子的数量在三个以上.
3 They will come back at ten o'clock (改写同义句)
They （won't）come back （until）ten o'clock.
他们要到十点才回来.
not ...until,直到某时才做.