根据英语学习的特点，编制一款可帮助学生背英文单词的小软件，要求具有以下功能：从词库中随机抽取一个单词，显示在屏幕上时，该单词被随机隐藏了一个、或两个、或三个字母，用户正确填空后，可得分；当得分累积到某些分值时，系统给予鼓励。

单词词库可以是任何合理的形式，如数组、字符串、文件等。用户可以设置每次使用时练习的单词组。用户填空时，可以有提示信息。-According to the characteristics of English language learning, the preparation of a background to help students of English words of small software requires the following features: a random sample from the thesaurus in a word, displayed on the screen, the words were randomly hide one, or two , or three letters, the user fill in the blank correctly, you can score　when the cumulative scoring of some scores, the system to give encouragement. Vocabulary words can be any reasonable form, such as arrays, strings, files. Users can set up each time you use the word when the group practice. Users fill in the blank when the message.