1.We will have to finish it at this time tomorrow.at=在
2.The firemen arrived soon and got the fire under control.under=在下 (在control下)
3.You can wash there spots off with a brush
off=下来
4.The printing office buys paper in quantities
5.He is ill,so I'll go there in place of him
6.Rain came down just before daybreak
down=下来
7.I have a poor sense of direction
不需修改
8.To our surprise,he failed the exam
To=给
9.Don't laugh at a person who is in trouble
at=向 (再这个句子当中这么用)
10.A person who put up a good plan will be rewarded.
up=上