They want some ____ (music) for the school music festival.
下列各式中,不能用完全平方公式分解的个数为( )
①x2﹣10x+25;②4a2+4a﹣1;③x2﹣2x﹣1;④-m2+m-14;⑤4x4-x2+14.
— How can I get information ________ space travel?
— You can go online to search ________ information.