用弹簧测力计吊着重力为10牛的金属块浸入水中，如果金属块的一半体积浸入水中，这时弹簧测力计的示数为8牛，此时金属块受到水的浮力大小为____ 牛。如果将金属块全部浸没水中（金属块不接触容器底部），则金属块所受浮力大小为____ 牛，这时弹簧测力计的示数为____ 牛。

    It's Sunday morning. There are many people in the park, some boys are playing basketball. There are some girls under a big tree. They're singing and dancing. What are those women doing? They are drinking tea. Look at the woman in a blue coat. Who's she? She's my mother. She is talking to Edward. Edward is her student. He is a good student. He studies hard. He's good at all the subjects. And he's friendly to all his teachers and his friends.

Let's ____ (make) a cake.

瑞典卡罗琳医学院宣布将诺贝尔生理学或医学奖授予中国女药学家屠呦呦。屠呦呦发明的青蒿素来自传统中药，从中草药的提取物中找到具有抗疟疾效果的物质，是利用中西医相结合的科研方法，她在处理中西医药关系上，立足国情，中西医结合，以我为主。这体现了（  ）

①实践是认识的来源

②新事物战胜旧事物是一帆风顺的

③医药学方面是无规律可循的

④认识和改造世界必须发挥人的主观能动性