请先阅读下面短文,掌握其大意,然后从各小题所给的A、B、C、D四个选项中选出可以填入相应空白处的最佳选项。
One day, Jack's parents told him that his grandpa would retire after working for forty years. Jack said in surprise, "I'm only seven, 1 it means grandpa has been working for a really long time!"
His parents said, "Yes. That's 2 we are going to have a surprise party for him."
Jack loved his grandpa and wanted to do something 3 for him. He 4 the business card his grandpa had given him two years before. He knew that his grandpa would no longer 5 the position on that card, so he decided to get a new one 6 his grandpa.
When the big day came, Jack was 7. But he didn't want to put his gift together with others. He carried it around with 8 the whole evening.
When all the other people 9, he took his grandpa's hand and brought him over to a chair and gave him the gift.
His grandpa smiled, "Well, it 10 be a beautiful gift. May I open it now?" "Sure!" Jack said excitedly.
11 grandpa opened the gift, tears came into his eyes, Jack gave him the 12 gift he had ever got! They were 13 cards with his new position; "FULL-TIME GRANDPA!" Jack said, "Now your full-time job is my grandpa!"
"Well, 14 do I get paid?" His grandpa asked, smiling. "As many hugs as you want!" With these words, Jack gave grandpa a hug, "Well, I guess that means I'm the 15 man in the world!" said grandpa.