【2015·浙江】If steel is heavier than water, why are ships able to on the sea?
He has thrown away his old shoes.He’ll have to buy ____.
I wonder whether he is ____ European or ____ American?
The pupil proved to be ___ honest child.
I have aleady waited here for ___ hour and ___ half.
I was ashamed____ my failing the exam and decided on a measure to make up for it.