1,Susan is 12 years old.Alice is 10 years old.Susan is Alice sister.Their mother is Sarah and their father is Simon.Susan and Alice are__sisters____.
2,感谢你的汉堡包和冰淇淋.
Thanks for your humburger and ice cream.
3,Meat is healthy food.Fish is healthy food.(合并为一句话)
Meat and fish are healthy food.
或者 Meat is heathy food,so does fish.