3 . 用a、an、the或“/”填空。
1. People invented ________ plane in ________ early 20th century.
2. New York is ________ very big city in ________ east of America.
3. ________ boy dressed in blue is waiting for you outside ________ door.
4. It is one of ________ tallest buildings in the city.
5. The pool is in ________ middle of the park.
6. Ben hit Billy in ________ face.
7. I work six days ________ week, often long into ________ night.
8. Take ________ medicine three times ________ day.
9. Danny works as ________ waiter at ________ night.
10. ________ rich are not always happier than ________ poor.