he did everything he could___the old man.填to save,做目的状语,谁能分析一下这个句子,总感觉少了个词呢.he could 是做定语吧,怎么感觉少了个do 呢,everything是先行词

He did everything he could sale the old man. He did everything he could to avoid it. Everything he said and did was to excess. he did everything he could do to ___his educationApay Bpay for Cspend for Dcost He'll understand one day that he did everything for him..I believe there wil did he------------?yes,he---------------- mr wu did almost everything he can（ to help him） 括号内提问 English:一道难题,Bill did everything he could ______(help) me. He'll understand one day that he did everything for him..I believe there will be such a day.. He's a b_____boy.he knows everything. He did everything he could to help the old man.=He helped the old man —— —— —— —｛4个空｝ What did he say? What music did he he just did it how did he go Yes,he did he did not _____anything He told as if he knew everything.还是He told as if he had known everything.