Jim can not play compurter games,he m ______ finish his homework first.
应填：must （必须）
译文：吉姆不可以打电动,他必须先完成他的家庭作业.
语法：must （主观上）必须
have to （客观上）必须不得不还有一个题啊It isn't p___ to make noise while the teacher is speaking. 谢了polite 有礼貌的