英语语法,How fast Tom runs!What fast Tom runs!请问为什么“How fast Tom

Tom runs fast.Jack runs faster than Tom.(合并成一句) Tom runs very fast.(改为感叹句） Who runs as fast as Tom ______? Tom runs fast.Mike runs faster.合并成一句怎么写? 合并成一句Tom runs fast.Jack runs faster than Tom.改为Tom does _ ru Jack runs fast,but Mike runs very fast.Tom can run 200 meter Tom runs fast,but Jack runs______ A.more fast B.much fast C. Jim runs as fast as Tom.(否定句） jim run fast .tom runs farst er 合并为一句话 Tom runs twice as fast as Mike.可不可以描述成Tom runs double as fas ______ fast can Tom run!填what还是how Tom runs fast but I run slowly.最后一个单词为什么用slowly而不用slow?