4辆小卡车和5辆大卡车一次共可运货27吨，6辆小卡车和10辆大卡车一次共可运货51吨，则小卡车和大卡车每辆车每次可以各运货（ ）吨。
As students, you must listen to the teacher attentively and keep a record ______ what the teacher says in class.
雪共____画，云共____画。
是的，我喜欢饼干。可以说：
