用"a","an","the"或"/"填空+用英语写出下列短语

一、1.an 2.an,a 3.the 4.a 5. 6.7.8.a 9.the 10.an 11.an
二、1.a tiger 2.an Eglish teacher 3.a piece of paper 4.a good idea 5.an interesting story 6.half an hour 7.a kind old man 8.under the tree 9.a woman with a baby in her arms 10.a boy with a book in his hand
三、1.the 2.the 3. 4.a 5