根据句意及汉语提示，写出个单词的正确形式，每空填一词。
The girl tried her best, but she got_________(少) progress.
Qtan Xuesen is one of the greatest_________(开拓者) of China's space technology.
Everyone hopes to live in the world __________(和平) with no wars.
Though Money isn't everything, it still________ (要紧) a lot to the poor.