This is    orange. That ruler is     orange.
A. an, /   B. an, an    C. a, an

---Mary, it’s going to rain. Better take ________ raincoat with you.
---Well, but I can’t find ________ raincoat I put here yesterday.

Martin was once ________ “problem student”, but now he’s one of ________ top students.

Kate has got ______ uncle. He’s ______ Chinese teacher.

—What can Jane do?
—She can play          chess and also          violin.

I have ________ useful knife and my sister has _______ eraser.

Who is _______ boy playing basketball on the playground.
He is Tom.  He joined ______ unusual basketball match last year.

—Can you remember when Mr. Green left _____ city?
—Sorry, I can’t. I only remember it was _____ Monday.

   18-year-old girl called Anna from        England visited          Great Wall last Friday .

— Lucy had __________ accident.
— But luckily, she wasn’t hurt in _______ event at all.