21．Little ______ about his own health though he was very ill.
A. he care B. he cares C. does he care D. did he care
22．________ and short of breath，Andy and Ruby were the first to reach the top of Mount Tai.
A．To be tired B．Tired C．Tiring D．Being tired
23．The day he had been looking forward to _____at last.
A. coming B. came C. had come D. have come
