1．
在下列名词前填上a或an。
1. ____________ egg
3. ____________ school
5. ____________ book
7. ____________ apple
9. ____________ Ss
11. ____________ umbrella
2. ____________ cat
4. ____________ orange
6. ____________ hour
8. ____________ car
10. ____________ Uu
12. ____________ pupil
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