完形填空
阅读下面短文，掌握其大意， 然后从21-40各题所给的四个选项（A、B、C和D）中，
选出最佳选项。
It was the old lady’s birthday. She got up early to be ready for the post. From the second floor flat she could see the postman when he came down the street，and a little boy，Johnnie，__1__her letters from the ground floor on the rare__2__when anything came.
Today she was sure there would be something.Myra__3__forget her mother’s birthday，even if she__4__wrote at other times. Of course Myra was busy，but？__5__，Enid，the daughter the old lady loved most，died two years ago. Since then Myra had been to see her mother three times，but her husband，Harold，never.
