1.The plane finally arrived on the airport _________(safe)

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1.The plane finally arrived on the airport _________(safe)
这道题为什么不能用safely 要用safety?
2.The ice on the river is not thick enough for us to skate on.(保持原意)
The ice on the river is ________ _________ for us to skate on.
这题为什么不能用thin enough ,而要用too thin?

1.safely 是副词,用来修饰动词arrive；而safety是名词,不能修饰动词.
2.too...to是固定搭配这里是too thin to skate on,意思是“冰面太薄了以至于我们不能在上面滑冰”.

1.The plane finally arrived on the airport _________(safe) the plane didn't arrived at the airport on time yesterday ev Luckily,I arrived at the airport just --------the plane took The plane landed on the airport s______. Hardly had they arrived at the airport ___the plane started luckily,the plane------at the airport in the heavy rain safe At last the old man arrived at the airport ___(safe) ______,we arrived at the airport on time.(luck) I arrived at the airport ____ the plane had taken off． A.aft I arrived at the airport so late that I ___ missed the plane I arrived at the airport so late that I ___missed the plane. I arrived at the airport ____ the plane had taken off