填空题
He was so happy to go home that he couldn't sleep on the train.
He was 1 happy to sleep on the train because he was going home.
1、
【正确答案】
1、to
【答案解析】[解析] 此句是考查句型结构“so…that…”与“too…to…”之间的转换，“too…to…”结构表示否定含义，而“so…that…”引导的句子中的that从句是否定，正好与“too…to…”的否定含义相吻合，所以答案为：He was too happy to sleep on the train because he was going home．