阅读下面的短文,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。
Jack sat alone on the bus ride home from school. All his friends were 1 their class projects excitedly, but Jack remained silent. How could they understand his feelings when their parents would help them? His parents worked all the time.
When the bus stopped, he raced home, 2 his schoolbag on the floor, and walked straight to his bedroom.
"Jack?" Grandpa's3 called out."Was that you?"
Jack stopped 4 he closed his bedroom door."Yes, Grandpa, it's me."
Grandpa Higgins came from the kitchen carrying a sandwich. "You don't sound okay," he said as he took a 5 .
Should Jack tell Grandpa the truth? What could it hurt? He quickly 6 they should do a class project for the weekend and together they would build something with an adult. The students needed to make a 7 to explain how their projects had gone.
Grandpa listened quietly. " 8 are you so unhappy?"
Jack felt his 9 and anger rising inside him. "Because I don't have anyone to help me." He sounded so sad and so angry.
Grandpa raised his eyebrows (眉毛) 10 . "What am I?" he asked gently. Jack froze. "You'd build a project with me, Grandpa?"
"Sure, I would," Grandpa said."Just let me finish this sandwich."
Jack's heart seemed so 11 that he thought it would float (漂浮) away. He rushed to the schoolbag and 12 his assignment paper (任务单). Then, they studied the assignment and made a list of ideas. Finally, they 13 to build a cardboard robot from old biscuit and noodle boxes. They used glue, staples (订书钉),and tape. Grandpa helped a lot and he 14 found a box of eyeball stickers (眼球贴纸).
When they finished, Jack looked at their misshapen (奇形怪状的) robot. He couldn't stop smiling. "I think it's the best 15 I have ever built. Now I have to write my report," Jack said, hugging Grandpa. "Thank you, Grandpa. I had a lot of fun."