demand :to ask for sth. very firmly；to say very firmly that sb. should have or do sth.指强烈要求,坚决要
require:[often passive](rather formal)to make sb. do or have sth,especially because it is necessaryaccording to a law or set of rules or standard指要求做（某事）,达到（某水平）,尤指根据法律或规定
command(给人或动物的)命令
request（正式或礼貌的）要求,请求
查字典哦