1. Nothing can live without air. (变为同义句) Nothing can live if __________ is _________ air. 2. It's about 20 minutes' walk to the farthest restaurant. (就划线部分提问) _________ _________ is it to the farthest restaurant? 3. The little girl is too young to stay at home by herself. (变为同义句) The little girl ________ old ________ to stay at home _______. The little girl is ________ young ________ she can't stay at home by herself. 4. I think math is the most difficult subject of all. (变为同义句) I think math is ________ ________ than the ________ subjects. 5. English is more interesting than history. (变为同义句) History is _________ interesting ________ English. History isn't so _________ as English.
Nothing can live if __________ is _________ air.