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完形填空（15分）
閱讀下面短文, 掌握其大意，然后從各題所給的A、B、C、D四個選項中，選出最佳選項。
I stood in the doorway, watching my elder brother carefully putting clothes into his bag. I coughed uneasily. Finally 　　36　　 that I was there, Rocky turned towards me with a sad smile.
“I’m 　　37　　 tomorrow,” he said.
“I know.” My __38____ was almost a whisper. I was 　　39　　 at myself for being so weak, but I wasn’t about to cry.
“My 　　40　　 is early, so there is still 　　41　　 time to come to the airport,” he said. Seeing the 　　42　　 look on my face, he quickly added, “I promise I won’t leave without saying goodbye.”
I tried to say 　　43　　 , but didn’t. It’s always 　　44　　 to keep quiet if you’re about to cry. “You promised you wouldn’t cry,” he said to me, thinking that I was close to 　　45　　.
I remember the day he taught me how to ride a bike. 　　46　　 I thought he was always right behind me, holding the seat to keep me from 　　47　　. I was happy with this, but he knew he couldn’t hold me up all my life. He told me that one day he would have to let go.
His coughing stopped my thinking. What was left to say? How could I say 　　48　　 to the person who taught me everything?
The next morning I 　　49　　 , looked at my alarm clock, and realized he had left　50　 ago. We never even said goodbye.
Goodbye, Rocky! Although he may have been many miles away, I knew he heard me, even if it was only an answer in his heart.