gistfile1.js

// ==UserScript==
// @name           auto fill form
// @namespace      crabtw@gmail.com
// @description    auto fill form
// @include        https://portal.yzu.edu.tw/WebQuestionnaire/Questionnaire.aspx*
// ==/UserScript==

var iter = document.evaluate(
    '//td/input[1]',
    document,
    null,
    XPathResult.UNORDERED_NODE_ITERATOR_TYPE,
    null
);

var inputs = iter.iterateNext();
while(inputs) {
    inputs.checked = true;
    inputs = iter.iterateNext()
}