—Mary is very clear and studies very hard.

—          she stands out in almost all her subjects that she learns.

A．No doubt

B．No problem

C．No way

D．No wonder

袋子里有4个白球、3个红球、2个黄球，一次摸出1个球，摸到______球可能性最大，要使摸到黄球的可能性最大，至少再放入______个黄球．