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 __________ (walk) to school. 小题2: The government should pay much attention to the __________ (increase) population. 小题3: The grand piano takes up too much __________ (room).。小题4: I think Beijing is one of the ___________ (beautiful) places in the world. 小题5: No one __________ (know) when he will be back. |