J____ from his face on which there was a confident smile, we know that he didn't lose heart.
中午,小张在教室里做作业没有回家吃饭,她也没有打电话告诉父母。晚上,小张放学回家,开始做作业,可是她的母亲一直在为中午小张未回家的事说个不停,这时小张应该( )
如下图,摆1个梯形需要4根小棒,摆2个梯形需要7根小棒…照这样摆下去,摆10个梯形,需要____根小棒,46根小棒可以摆____个这样的梯形。