完形填空：共15小题:每题2分，共30分。通读下面的短文，掌握其大意。然后，从每小题的四个选择项中选出可填入相应空白处的最佳选项。
Mrs. McTavish looked out. “It’s a lovely day. Would you like to go for a walk in the park?” Her children __21__ with excitement.
“Before we go, you need to follow some rules. Everyone must __22__ hands and stay close to me. You can’t __23__ anywhere by yourself. Can you all do that?”
All four __24__ they would. As they walked down the street, Fiona said, “I want an ice lolly (冰棍), Mummy. Can we have some?”
“You can if you follow the rules ,” answered Mrs. McTavish.
The park is just around the corner. The children ran off to __25__. After a while, when Mrs. McTavish looked up she couldn’t see Jock. “Fiona, where’s Jock?”
“I don’t know, Mummy. He’s not here __26__, ” said Fiona.
The others hadn’t __27__ Jock either. Mrs. McTavish had to gather her children together and walk around the park __28__ for him. She found him sitting near the ice lolly man. “Jock! What are you doing here? I couldn’t __29__ you.”
“Mummy, I want an ice lolly,” Jock whispered.
“You can’t have one now __30__ you didn’t follow the rules. ” Mrs. McTavish __31__ one for each of the other children and they licked (舔) them all the way home. Jock cried. When they __32__ home she talked to Jock. “Mummy has four children. I must have rules so I can __33__ an eye on you and know you’re __34__.” Jock said he was __35__ and he would follow the rules from then on.