用“a 或“an 填空.1. I want to eat donut. 2. I want to

用“a”或“an”填空。1. I want to eat donut.

2. I want to draw umbrella.

3. I want to sing song.

4. This is old book.

5. airplane is fast.

试题答案

1. a 2. an 3. a 4. an 5. An