阅读下面短文，从每题所给的A、B、C、D四个选项中选出可以填入空白处的最佳选项。That morning in September, at a five-kilometer race, I waited for my 11-year-old son at the finish line. He'd run 30:34 at another 5k in late spring, so I 1 he could run a 5k in about 30 minutes. When I didn't see him at the 35-minute mark, I began to 2 .
It'd already been an 3 morning. About an hour earlier, when we drove into town, my son noticed a lovely tiny green tree cricket （树蟋） in my car. It jumped onto my son's hand where it stayed so long that we eventually gave it a name: Little Friend.
Minutes before the race, it jumped onto the sidewalk. Maybe it wanted to seek freedom, but this wasn't a safe place due to the 4 pedestrian traffic. So my son knelt and 5 his hand. Little Friend came back. But I told him he would 6 it during the race.
I ran well and felt thrilled at the finish line. However, that 7 gave way to anxiety when my son didn't show up. I 8 asking people if they'd seen him. No one had. So I returned to the race headquarters. In my confusion, I didn't even see him 9 the finish line. But there he was, just ahead of the 45-minute mark, with Little Friend 10 on his right thumb.
My 11 were wrong. My son didn't run fast, and he didn't lose Little Friend. These two 12 seemed somehow related. He 13 a cold he was getting over, but I knew it was more than that.
Sometimes life gives you something beautiful, but fragile （易碎的）. There's no need to 14 ahead. Treat it 15 and hold on when you can.
