V- Em hãy điền mạo từ a, an, the hoặc 0 thích hợp vào chỗ trống trong đoạn văn sau:
1. Mr. Thanhhas .................appointment at 4 o’clock .............. this afternoon.
2. Yesterday ............... dentist fill ............... cavity in my tooth.
3. What’s ................ wrong with Sue?
    - She has ................ toothache.
4. Last month we visited ............. old church. It’s in .............. suburb of ............ city.
5. Mrs. Quyen is ................ very good doctor.