Why____(not buy)some postcards for the exchange students?

Why____(not buy)some postcards for the exchange students? why____(not go)for a week 是why not buy some还是why not buy any why not buy him some sweeter?是病句吗 ( )(not write)on the wall Let us ( )(buy)some things buy some why not sing a popular song?(同义句） why____ _____ sing a popular song?帮哈忙, Why do not you say it in English?(同义句) Why____ _____ it in English? What about having some more vegetables?同义句why____ ____some more vegetables?____ about having some more vegetables There are __ __sweets there,I want to buy some.A,.not B.some C.any if the food tastes nice ,we will buy some,if not,].填no还是填not? but why ( )some bananas?A.not buy B.don't buy C.not you buy D.don't 为什么要选择A?说一下原因,谢 wht not 和why don't有区别吗?why____ we start at once 是不是两个都可以填？ W()not buy her some comic books?She also likes r()very much. why not buy ____ snacks? A any B much C some D a little she___(buy)some books buy some medicina造句 there is （ ）food here .we have to buy some.A .any B some C　no　　D　not选什么?