题目

用所给单词的适当形式填空。common,reason,serious,free,help （1） One of the main is that this book is interesting, so it is very popular. （2） He can't go with us. He has to his parents at home. （3） I'm this evening. I want to go to the movies. （4） English is important, you should take it . （5） These books have nothing in . 答案：【1】reasons 【1】help 【1】free 【1】seriously 【1】common由5个大小相同的正方体组成的几何体如图所示，其主视图是（     ）A．B．C．D．