阅读下面短文，从短文后各题所给的A、B、C、D四个选项中，选出可以填入空白处的最佳选项。

    Mrs. West lives in Hangzhou. We know that Hangzhou is very hot in summer.1 , many people don't want to go out after 2  . But Mrs. West has to  3  her father at the bus stop in such a hot afternoon.

    Her father, Harry, is sixty years old. He lives in a small town. These days he doesn't feel well. So Mrs. West4 him and asks him to come to see a 5 in the hospital in the city. Because she thinks the hospital there may be6 for him.

    Now she 7  on the way to the bus stop. There 8  no trees and she feels very hot. But she's too fat and can't walk fast（快）. She walks and walks. Suddenly she finds a boy walking behind her. She gets9 .

    "Why are you walking behind me, boy?" she asks angrily.

    "It's 10 ." the boy answers.