I think the best place to go on Sunday is the zoo. When you are 1, you can go there with your family.  2 the zoo, there are many animals: elephants, deer , 3, rabbits and other animals. Elephants are the 4 animals on land. I 5 there is a baby elephant in our zoo. So I want to 6 at it. Yu Xuan wants to go with me. She says, " 7 we go there together?" "Sure!" I say. "We can 8 a good time there. But let's 9 there at half past four. I have 10 homework to do."

 某兴趣小组为验证质量守恒定律，做了镁条在空气中燃烧的实验．