1. Flying demands a much greater supply of energy than ______ most other forms of transportation.
可以通过下三部去理
1）句子还原：
Flying demands a much great supply of energy than other forms of transportation demand it.
2） 由于主句和从句中都有重复的词语 demand it,从句中的就可以用助动词 do 取代以避免读起来声音重复的凝重,成为：than other forms of transportation do.
3）为了强调,可以把 do 提前成为 than do other forms of transportation
注意：助动词 do 常用来取代与上文重复的谓语部分,如：
He likes to play games and so do I. (do 代替 likes to play games)
Do you go shopping on weekends? Yes, I do. (do 代替 go shopping on weekends)
2.It is no possibility that Bob can win the first prize in the match.
1）要使其成为同位语从句,这个句子需要改为：
There will be no possibility that Bob can win the first prize in the match.
主句所以用将来时态是由于从句中的 can win 指的是将来的可能性,语法要求名词从句需要与主句保持时态一致.
2）这是一个主语从句,通过把句子还原可以看清：
That Bob can win the first prize in the match is no possibility
很明显这是一个用形式主句表示的主语从句.由于主部分很长,而表语部分却只有两个词,句子显得头重脚轻,所以把主语拖后改用形式主语表示.