题目内容
根据句意和汉语注释，写出单词的正确形式。
1.There was a large family photo ____________（悬挂）on the wall.
2.The population in this city has ___________（增加）from 1.2 billion to 1.8 billion.
3.Three ___________（四分之一）of the boys in our class like ball games.
4.I carelessly dropped some paint on the __________（表面）of the desk while painting.
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