All matter,______it is gas,solid or liquid,...为什么填whether不能填no matter啊,请高手解答

All matter,______it is gas,solid or liquid,...为什么填whether不能填no matter啊,请高手解答
谢谢各位的答案。但是有句子No matter it is rainy or windy,I will have to go to school.无论是刮风还是下雨，我都要去上学。在此no matter后面也不一定要用疑问词啊