【2015·浙江】If steel is heavier than water, why are ships able to on the sea?
47. Although he 's wealthy,he spends_____________ on clothes.
48. They were all tired, but _____ of them would stop to take a rest.
49. I don’t know whether small oranges are sweeter than big ______.
50. When they met, they stopped and said hello to_______.
51. After everyone took_______ place, the meeting began.