问题补充：
用括号内所给单词的适当形式填空。
【小题1】It usually takes me half an hour to walk (walk) to school.
【小题2】The government should pay much attention to the increasing (increase) population.
【小题3】The grand piano takes up too much room (room).。
【小题4】I think Beijing is one of the most beautiful (beautiful) places in the world.
【小题5】No one knows (know) when he will be back.
答案：
解析：
【小题1】句意：步行去学校通常花费我半个小时时间。It takes sb. some time to do，故答案是to walk.
【小题2】句意：政府应该关心正在在增长的人口问题。用动词的ing形式修饰名词，故答案是increasing。
【小题3】句意：这个大钢琴占据了太多空间。room当空间时是不可数名词，故填room。
【小题4】句意：我认为北京是世界上最漂亮的地方之一。 one of+最高级+可数名词复数，故填most beautiful.
【小题5】句意：没有人知道他什么时候回来。No one是不定代词，用作主语时用作第三人单数，故填knows.
用括号内所给单词的适当形式填空。【小题1】It usually takes me half an hour to walk (walk) to school. 【小题2】The g
