Only he knows the answer to Exercise One=_ _ _ knows the ans

Only he knows the answer to Exercise One=_ _ _ knows the ans He couldn't answer this questin just now.=He _ _ _/_ _ _ ans He has a qu_ _ _ mind.He is always the first to find the ans You're the only one that ( knows ) the answer to the questio He used sand to put out the fire.=He _ _ the fire _ _. Only Tom knows the answer to the qusetion.改成同义句 Tom( ) knows Everybody knows the answer.(改为反意疑问句） Everybody knows the ans he Usually does to School-----foot who knows the answer----- The question is _ to answer.(easy) Who knows the answer? he knows the answer.Ialso know it. maybe he knows the answer 另一种说法