you may choose whoever you think is suitable

请注意,whoever/whicnever/whatever只有在引导让步状语从句时才分别等于no matter who/which/what..在引导名词性从句时不可以更换,只能使用前面的形式.本题中whoever引导的是宾语从句.所以,如果两个空格就要填anyone that ,三个空格只好填any person that