The cat is _____(in the tree/on the tree)快 要说明为什么

The cat is _____(in the tree/on the tree)快 要说明为什么
The cat is _____(in the tree/on the tree)
快 要说明为什么

The cat is _____(in the tree/on the tree)快 要说明为什么
in the tree
注：外来物在树上用IN

in the tree
on the tree是指长在树上的

in the tree
当长在树上，就用on the tree。eg：there are many apples on the tree.