阅读下面的短文，用括号内所给词的适当形式填空，必要时可加助动词．请将答案填写在文后相应的横线上．Onceuponatime，therewasatravelerwhohadaabighorseandasmalldonkey．Whilehewastraveling

　　阅读下面的短文，用括号内所给词的适当形式填空，必要时可加助动词．请将答案填写在文后相应的横线上．

　　Once upon a time，there was a traveler who had a a big horse and a small donkey．While he was traveling，the horse and the donkey carried all kinds of things on （56）___（they） backs for him．The big horse was very strong but he carried as（57）___（heavy） as the small donkey．

　　At （58）___ （one），the donkey was able to keep up with the big horse．But after some time，he donkey began to feel too tired （59）___ （keep ） up any more．So the donkey asked the horse，"Brother Horse，could you please help me？I am afraid I can't go on（60）___（carry） my load（负荷物）．"

　　"No，you carry yours．I carry（61）___ （my）．It is not my problem that you are not as strong and big as me，"answered the horse，（62）___（feel） very proud that he was（63）___（strong）．

　　Not long after that，the donkey at last（64）___（fall） down to the ground and died．

　　Their（65）___（own） moved what the donkey carried onto the back of the horse．Now the horse had to carry the double load for the rest of the journey，and he regretted（后悔）what he did to the donkey．"If I had helped the donkey out，at （66）___（little）he could carry something．"the horse said to （67）___（he）．But it was too late．