Amy is fifteen years old.millie is eighteen years old.合并成一句

Amy is three years younger than Millie.
Millie is three years older than Amy.jack is smart,tom is smart,too(改为同义句)多谢~~~Both Jack and Tom are smart.jack is smart,tom is smart,too(改为同义句)jack is____ ____ _____tomJack is as smart as Tom.