C# Microsoft.Office.Interop.Word 替换为 Selection.Find.Execute() 超过第一个单词

我尝试使用 Microsoft.Office.Interop.Word 在 C# 中制作报告。我有一个模板和一些我想替换的不同单词。但如果我使用

> Selection.Find.Execute()

它只替换第一个单词。我的代码：

 Word.Application app = new Word.Application();
            Word.Document doc = null;

            object template = "ReportTest.dotx";
            object toFile = "ReportFinish.doc";

            object missing = System.Reflection.Missing.Value;

            doc = app.Documents.Open(template, missing, missing);
            app.Selection.Find.ClearFormatting();
            app.Selection.Find.Replacement.ClearFormatting();

            app.Selection.Find.Execute("[organisation]", missing, missing, missing, missing, missing, missing, missing,
                missing, "Firedepartment");
            app.Selection.Find.Execute("[trainer]", missing, missing, missing, missing, missing, missing, missing,
                missing, "John Silver");

            app.Selection.Find.Execute("[trainee]", missing, missing, missing, missing, missing, missing, missing,
                missing, "Smith");

            object Save = (object) toFile;
            doc.SaveAs(Save,missing,missing,missing);

            doc.Close(false,missing,missing);
            app.Quit(false,false,false);
            System.Runtime.InteropServices.Marshal.ReleaseComObject(app);

所以如果它成立了组织，它会用 Firedepartment 取代它，但另一个没有改变。那么有没有办法替换所有不同的单词？

单词模板看起来像：

Department: [organisation] 
Trainer: [trainer] 
Trainee: [trainee]`

完成文件应如下所示： 部门：Firedepartment 培训师：John Silver 实习生：Smith

谢谢你的帮助