A.I had noodles for breakfast yesterday. B.There were lots of oranges in the tree.
A.You are a bad boy. B.You are a good boy.
A.The magic paintbrush didn't become gold. B.He had a paintbrush.
A.您好,大明。 B.这位是大明。 C.大明是一个学生。
A,a B.an C.some