-Have you written anything on Chinese traditional food so far?-__________, but I have a plan for it.
The old woman kept one black dog and two white ____.
–Is this orange radio _____? -- No, it belongs to ______.
______ book on the desk is _____ useful one.
–How many _____ are there in your school, Tom? -- Two.
He made up his mind to devote his life pollution happily.