根据句意和汉语注释，在答题卡标有题号的横线上，写出单词的正确形式。
It is well known to everyone that one fifth is eight           (四十).
Have you thought of a useful way to solve it after __________ (考虑) the problem for 3 days?
I don’t like that I’m often ______________ (比较)with my classmates by my mother.
Is it true that the robot can do ______________(无论什么) it is asked to?