A and An

請用A或An來填空:
1. Sarah is __ sad child.
2. Henry is __ unusual man.
3. It is __ egg from __ ostrich.
4. It is __ banana.
5. It is __ sunny day.
6. It is __ short trip, but it isn't __ easy trip.
7. It is __ ugly building.
8. Mary owned __ old building.


解答:
1. A
2. An
3. An, An
4. A
5. A
6. A, An
7. An
8. An