根据运算定律，在下面填上适当的数。

(25＋46)×4=____×____＋____×____

    Today is Mike's surprise party. His parents are at home. They are making a ____ and some cookies. ____cookie has a letter. His parents don't ____ him about the party. The party ____ at 5：00. Lily comes to Mike's home before 4：00. She is ____.

    Mike is shopping for gifts. He needs gifts for everyone. At 4：30, he arrives home. How surprised he is！ ____of the people have a good time.

植物任何部位的活细胞都能进行：（   ）                   

某兴趣小组做完氢氧化钠与稀硫酸反应的实验后，对反应后溶液中溶质的成分进行了探究，请和他们一起探究并回答相关问题。

【提出问题】溶液中溶质的成分是什么？

【建立猜想】①只有Na₂SO₄；②有Na₂SO₄和H₂SO₄两种物质；③有Na₂SO₄和NaOH两种物质。